1. A man rows a boat 18 kilometers in 4 hours downstream
and returns upstream in 12 hours. The speed
of the stream (in km per hour) is :
(a) 1 (b) 1.5
(c) 2 (d) 1.75

2. A boat goes 20 km downstream in one hour and the
same distance upstream in two hours. The speed of
the boat in still water is
(a) 15 km/hr (b) 10 km/hr
(c) 5 km/hr (d) 7.5 km/hr

3. A man rows 750 m in 675 seconds against the stream
and return in 15/2 minutes. Find his rowing speed in
still water.
(a) 3 kmph (b) 4 kmph
(c) 5 kmph (d) 6 kmph

4. A boat goes 6 km an hour in still water, it takes thrice
as much time in going the same distance against the
current comparison to direction of current. The speed
of the current (in km/hour) is
(a) 4 (b)5
(c)3 (d) 2

5. A boat goes 40 km in the stream in 8 hours 36 km
downstream in 6 hours. The speed of the boat in still
water is
(a) 6.5 km/hour (b) 5.5 km/hour
(c) 6 km/hour (d) 5 km/hour

6. A man can row boat at 5 kmph in still water. If the
velocity of current is 1 kmph and he takes 1 hour to
row to a place and come back, how far is the place ? ?
(a) 2.5 km (b) 3 km
(c) 2.4 km (d) 3.6 km

7. A motorboat in still water travels at a speed of 36
kmph. It goes 56 km upstream in 1 hour 45 minutes.
The time taken by it to cover the same distance down
the stream will be :
(a) 2 hrs 25 min. (b) 3 hrs
(c) 1 hrs 24 min. (d) 2hrs 21 min

8. A man Can row at speed of 9/2 km/hr in still water if
he takes 2 times as long to row the same distance
downstream , then the speed off stream (in km/hr) is
(a) 1 (b) 1.5
(c) 2 (d) 2.5

9. 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
(a) 5 hrs 50 min (b) 6 hrs
(c) 6 hrs 50 min (d) 12 hrs 10 min

10. A man can row 15 km/hr downstream and 9 km/hr
upstream. The speed of the boat in still water is :
(a) 8 km/hr. (b) 10 km/hr.
(c) 15 km/hr. (d) 12 km/hr