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Boats & Streams

1.

A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

Rate downstream = 16/2 kmph = 8 kmph.

Rate upstream = 16/4 kmph = 4 kmph.

Speed in still water = 1/2 (8 + 4) kmph = 6 kmph.

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2.

In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

Speed in still water = 1/2(11 + 5) kmph = 8 kmph.

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3.

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:

No answer description available for this question.

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4.

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?

No answer description available for this question.

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5.

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: