11.

A streamer goes downstream from one port to another in 4 hours. It covers the same distance upstream in 5 hours. If the speed of stream is 2 km/h, the distance between the two ports is

A) 50 km

B) 60 km

C) 70 km

D) 80 km

E) 75 km

12.

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 12 km/hr, while the other sails on a boat at a speed oi 10 km/hr. If the river flows at the speed of 4 km/hr, which of the two friends wit return to place A first ?

A) cyclist

B) boat sailor

C) together

D) None of these

E) Cannot be Determined

13.

A man can row 40 km upstream and 55 km downstream in 13 hours. Also, he can row 30 km upstream and 44 km downstream in 10 hours. Find the speed of the man in still water and the speed of the current.

A) 4 km/hr

B) 1 km/hr

C) 2 km/hr

D) 3 km/hr

E) 5 km/hr

14.

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) 2 km/hr

B) 22 km/hr

C) 2.2 km/hr

D) 20 km/hr

E) 30 km/hr

15.

A man can row $7\frac{1}{2}$ kmph in still water. If in a river running at 1.5 km an hour, it takes him 50 minutes to row to a place and back, how far off is the place ?

A) 3 km/hr

B) 4 km/hr

C) 5 km/hr

D) 6 km/hr

E) 7 km/hr

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