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01.

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

Answer and Explanation

Answer: 3 : 1

Explanation:

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02.

A man rows downstream 32 kms and 14 kms upstream. If he takes 6 hours to cover each distance, then the velocity of the current is

A.	½ kmph	B.	1 kmph
C.	1 ½ kmph	D.	2 kmph

Answer and Explanation

Answer: 1 ½ kmph

Explanation:
Rate downstream = 32/6 kmph : rate upstream = 14/6 kmph
Hence, Velocity of current = ½ (32/6 – 14/6) kmph = 3/2 kmph = 1 ½ kmph

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03.

A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is:

A.	4	B.	5
C.	6	D.	10

Answer and Explanation

Answer: 5

Explanation:

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04.

A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:

A.	8.5 km/hr	B.	9 km/hr
C.	10 km/hr	D.	12.5 km/hr

Answer and Explanation

Answer: 10 km/hr

Explanation:
Man's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr.
Man's rate against the current = (12.5 - 2.5) km/hr = 10 km/hr.

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05.

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 10 mph, the speed of the stream is:

A.	2 mph	B.	2.5 mph
C.	4 mph	D.	3 mph

Answer and Explanation

Answer: 2 mph

Explanation:

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