71. A
man can row 18 kmph in still water. It takes him thrice as long to row up as to
row down the river. Find the rate of stream.
A.)
5 km/hr.
B.)
9 km/hr.
C.)
15 km/hr.
D.)
22 km/hr.
72.A
boatman goes 2 km against the current of the stream in 1 hour and goes 1 km
along the current in 10 minutes. How long will it take to go 5 km in stationary
water?
A. 40 minutes B. 1 hour
C. 1 hr 15 min D. 1 hr 30
min
73.A
man can row three-quarters of a kilometer against the stream in 11 1
minutes.
4
The
speed (in km/hr) of the man in still water is:
[A]
2
[C]
4
[B]
3
[D]
5
74.A
man can row three-quarters of a kilometre against the stream in 11 minutes and
down the stream in 7 minutes. The speed (in km/hr) of the man in still water
is:
A. 2 B. 3
C. 4 D. 5
75. In a
stream running at 2 kmph, a motorboat goes 6 km upstream and back again to the
starting point in 33 minutes. Find the speed of the motorboat in still water.
A.)
12 kmph
B.)
15 kmph
C.)
22 kmph
D.)
30 kmph
76.Speed
of a man is 10 km/hr in still water. If the rate of current is 3 km/hr, then
the effective speed of the man upstream is
[A]
7 km/hr
[C]
9 km/hr
[B]
8.5 km/hr
[D]
None of these
77.Speed
of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph.
A man rows to a place at a distance of 105 km and comes back to the starting
point. The total time taken by him is:
A. 16 hours B. 18 hours
C. 20 hours D. 24 hours
78.In
one hour, a boat goes 11 km along the stream and 5 km against the stream. The
speed of the boat in still water (in km/hr) is:
A.)
3
B.)
5
C.)
8
D.)
9
79.A
boat running upstream takes 8 hours 48 minutes to cover a certain distance,
while it takes 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?
[A]
2 : 1
[C]
8 : 3
[E]
None of these
80.
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) and the stream is:
A. 2 : 1 B. 3 : 1
C. 3 : 2 D. 4 : 3
