16.

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) 7 km/hr

B) 10 km/hr

C) 9 km/hr

D) 8 km/hr

E) 9 km/hr

17.

A man can row upstream at 7 kmph and downstream at 10 kmph. Find man's rate in still water and the rate of current.

A) 1 km/hr

B) 1.5 km/hr

C) 2 km/hr

D) 8 km/hr

E) 6 km/hr

18.

A man takes 3 hours 45 minutes to row a boat 15 km downstream of a river and 2 hours 30 minutes to cover a distance of 5 km upstream. Find the speed of the river current in km/hr.

A) 1 km/hr

B) 2 km/hr

C) 1.5 km/hr

D) 8 km/hr

E) 7 km/hr

19.

A man swimming in a stream which flows 1.5 kmph, finds that in a given time he can swim twice as fast with the stream as he can against it. At what rate does he swim ?

A) 4 km/hr

B) 4.5 km/hr

C) 5 km/hr

D) 5.5 km/hr

E) 6 km/hr.

20.

A boat covers 24 km upstream and 36 km downstream in 6 hours while it covers 36 km upstream and 24 km downstream in $6 \frac{1}{2}$ hours. The velocity of the current is :

A) 1 km/hr

B) 1.5 km/hr

C) 2 km/hr

D) 2.5 km/hr

E) 3 km/hr

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