BOAT AND STREAM
1.
A boat goes 20km
downstream in one hour and the same distance upstream in two hours. The speed
of the boat in still water is
(1) 15km/hr (2) 10km/hr (3) 5km/hr (4) 7.5km/hr (5) None
of these
2.
A man roes a boat 18km
in 4 hours downstream and returns upstream in 12 hours. The speed of the stream
(in km/hr) is
(1) 1 (2) 1.5 (3) 2 (4) 1.75 (5) None of these
3.
A man can row upstream
at 8 km/hr and downstream at 13 km/hr. The speed of the stream is
(1) 2.5km/hr (2)
4.2km/hr (3) 5km/hr (4) 10.5km/hr (5) None of these
4.
A man rows downstream
32km and 14km upstream. If he takes 6hrs to cover each distance, then the
velocity(in kmph) is
(1)
(2) 1 (3) 1
(4) 2 (5) None of these
5.
A boat running
downstream covers a distance of 16km in 2 hrs while for covering the same
distance upstream, it takes 4 hrs. What is the speed of the boat in steal water
?
(1) 4kmph (2)
6kmph (3) 8kmph (4) Data inadequate (5) None
of these
6.
A man swims downstream
a distance of 15km in 1 hr. If the speed of the current 5 kmph, then time taken
by the man to swim the same distance upstream is
(1) 1hr 30min (2) 45min (3) 2hrs 30min (4) 3hrs (5) None of these
7.
A man rows 750m in
675s against the stream and returns in 7
min. Find his rowing speed in still water
(1) 3kmph (2) 4kmph (3) 5kmph (4) 6kmph (5) None of these
8.
A motorboat in still
water travels at a speed of 36 kmph. It goes 56km upstream in 1 hr 45 min. The
time taken by it to cover the same distance down the stream will be
(1) 2 hrs 25min (2) 2hrs (3) 1 hr 24min (4) 2hrs 21min (5) None of these
9.
A boatman goes 2km
against current of the stream in 1hr and goes 1km along the current in 10 min.
How long will it take to go 5km in stationary water?
(1) 40min
(2) 1hr (3)
1hr 15min (4) 1hr.30min (5) None of these
10.
A man can row three
quarters of a kilometer against the stream in 11
min and along the stream in 7
mi8n. The speed (in kmph) of the man in
still water is:
(1) 2 (2) 3 (3) 4 (4) 5 (5) None of these
11.
If a boat goes 7km
upstream in 42min and the speed of the stream is 3kmph, then the speed of the
boat in still water is
(1) 4.2kmph (2) 9kmph (3) 13kmph (4) 21kmph (5) None
of these
12.
A boat can travel with
a speed of 13kmph in still water. If the speed of the stream is 4kmph, then
find the time taken by the boat to go 68km downstream
(1) 2hrs (2) 3hrs
(3) 4hrs (4) 5hrs (5) None of these
13.
Speed of a boat in
standing water is 9 kmph and the speed of the stream is 1.5kmph. A man rows to
a place at a distance of 105km and comes back to the starting point. The total
time taken by him is
(1) 16hrs (2) 18hrs (3) 20hrs (4) 24hrs (5) None
of these
14.
The speed of a
motorboat is to that of the current of water as 36:5. The boat goes along with
the current in 5hrs 10min. It will come back in
(1) 5hrs 50min (2) 6hrs (3) 6hrs 50 (4) 12hrs 10min (5) None of these
15.
A man can row at 5 kmph
in still water. If the velaocity of current is 1kmpr and it takes 1 hr to row
to a place and come back, then how far is the place?
(1) 2.4km
(2) 2.5km
(3) 3km (4) 3.6km (5) None of these
16.
A boat takes 19hrs for
travelling downstream from point A to point B and coming back to a point C
which is midway between A and B. If the velocity of the stream is 4kmph and the
speed of the boat in still water is 14kmph, then what is the distance between A
and B?
(1) 160km (2) 180km (3) 200km (4) 220km (5) None of these
17.
A man can row 7
kmph in still water. If in a river running
at 1.5kmph, then it takes him 50min to row to a place and back, how far off is
the place?
(1) 2 (2)
3 (3) 4 (4) 5 (5) None of these
18.
A motorboat, whose
speed is 15kmph in still water, goes 30km downstream and comes back in total
time of 4 hrs 30min. The speed of the stream (in kmph) is
(1) 4 (2) 5 (3) 6 (4) 10 (5) None of these
19.
In a stream, running
at 2kmph, a motorboat goes 6 km upstream and back again to the starting point
in 33 min. Find the speed of the motorboat in still water
(1) 20kmph (2) 21kmph (3) 25kmph (4) 22kmph (5) None
of these
20.
A man can row 30 km
downstream and return in a total of 8hrs. If the speed of the boat in still
water is four times the speed of the current, then the speed of current is
(1) 1kmph (2) 2kmph (3) 4kmph (4)
3kmph (5) None
of these
21.
A man can row 6kmph in
still water. If the speed of the current is 2kmph, then it takes 3hrs more in
upstream than in the downstream for the same distance. The distance is
(1) 30km (2) 24km (3) 20km (4) 32km
(5) None of
these
22.
In a fixed time, a boy
swims double the distance along the current that he swims against the current.
If the speed of the current is 3kmph, then the speed of the boy in still water
is
(1) 6kmph (2) 9kmph (3) 10kmph (4) 12kmph (5) None of these
23.
A man takes twice as
long to row a distance against the stream as to row the same distance in favour
of the stream. The ratio of the speed of the boat(in still water) to the stream
is
(1) 2 : 1 (2) 3 : 1 (3) 3 : 2 (4) 4 : 3 (5) None of these
24.
There is a road beside
a river. Two friends started from a place A, moved to a temple situated at
another place B and then returned to A again. One of them moves on a cycle at a
speed of 12kmph. While the other sails on a boat at a speed of 10kmph. If the
river flows at the speed of 4kmph, then which of the two friends will return to
place A first?
(1) cyclist (2) sailor (3) Both came at same time (4) Can’t be determined (5) None of these
25.
A boat running
upstream takes 8 hours 48 minutes to cover a certain distance, while it takesd
4 hours to cover the same distance running downstream. What is the ratio
between the speed of the boat and speed of the water current respectively ?
(1) 2 : 1
(2) 3 : 2
(3) 8 : 3 (4) Cannot
be determined (5) None of these
26.
A man can row 9
kmph in still water and finds that it takes
him thrice as much time to row up than as to row down the same distance in the
river. The speed of the current is :
(1) 3
km/hr (2) 3
km/hr (3) 4
km/hr (4) 4
km/hr
(5) None
of these
27.
A boat takes 90
minutes less to travel 36 miles downstream than to travel the same distance
upstream. If the speed of the boat in still water is 10mph, the speed of the
stream is :
(1) 2 mph (2) 2.5
mph (3) 3 mph (4) 4 mph (5) None of these
28.
At his usual rowing
rate, Rahul can travel 12 miles downstream in a certain river in 6 hours less
than it takes him to travel the same distance upstream. But if he could double
his usual rowing rate for his 240miles round trip, the downstream 12 miles
would then take only one hour less than the upstream 12 miles. What is the
speed of the current in miles per hour ?
(1) 1
(2) 1
(3) 2
(4) 2
(5) None of these
29.
A swimmer swims from point A against a
current for 5 min and then swims backwards in favour of the current for next 5
min and comes to the point B. If AB is 100 m, the speed of the current (in
km/hr) is
(1) 0.4
(2) 0.2 (3) 1
(4) 0.6 (5) None of these
30.
A boat goes 12 km downstream and comes
back to the starting point in 3 hours. If the speed of the current is 3 km/hr,
then the speed (in km/hr) of the boat in still water is
(1) 12 (2) 9 (3) 8
(4) 6 (5) None of these
31.
A boat takes half time in moving a
certain distance downstream than upstream. The ratio of the speed of the boat
in still water and that of the current ?
(1) 2 : 1 (2) 1 : 2
(3) 4 : 3 (4) 3 : 1 (5) None of these
32.
A man can row at a speed of 4
km/hr in still water. If he takes 2 times as
long to row a distance upstream as to row the same distance downstream, then
the speed of stream (in km/hr) is
(1) 1 (2) 1.5
(3) 2 (4) 2.5 (5) None of these
33.
The speed of a boat in still water is
6 kmph and the speed of the stream is 1.5 kmph. A man rows to aplace at a
distance of 22.5 km and comes back to the starting point. The total time taken
by him is :
(1) 10 hours (2) 4 hours 10 minutes
(3) 6 hours 10 minutes
(4) 8 hours (5) None of these
34.
The speed of a motor-boat is that of
the current of water as 36 : 5. The boat goes along with the current in 5 hours
10 minutes. It will come back in
(1) 5 hrs 50 min (2) 6 hrs (3) 6 hrs 50 min (4) 12
hrs 10 min (5) None of these
35.
Two boats A and B start towards each
other from two places, 108 km apart. Speed of the boat A and Bin still water
are 12 km/hr and 15 km/hr respectively. If A proceeds down and B up the stream,
they will meet after.
(1) 4.5 hrs (2) 4 hrs (3) 5.4 hrs (4) 6
hrs (5) None of these
36.
A man can row 6 km/hr in still water.
If the speed of the current is 2 km/hr, it takes 3 hrs mare in upstream than in
the downstream for the same distance. The distance is
(1) 30
km (2) 24 km (3) 20
km (4) 32 km (5) None
of these
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