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Question

A boat can go 65km upstream in 5 hours and 69km downstream in 3 hours. Find the speed of boat in still water.

A
12km/hr.
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B
18km/hr.
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C
16km/hr.
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D
21km/hr.
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Solution

The correct option is B 18km/hr.
It is given that boat can go 65 km upstream in 5 hours that is:

Upstream speed=655=13 km/hr

Also, the boat can go 69 km downstream in 3 hours

Downstream speed =693=23 km/hr

We know that Speed in still water=12(upstreamspeed+downstreamspeed) km/hr

Speed in still water =12(13+23)=18 km/hr

Hence, the speed of boat in still water is 18 km/hr.

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