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Question -

A boat goes 12 km upstream and 40 km downstream in 8 hours. It can go 16 km upstream and 32 km downstream in the same time. Find the speed of the boat in still water and the speed of the steam. [CBSE 1999C]



Answer -

Let the speed of boat = x km/hr
and speed of stream = y km/hr
=> Speed of the boat upstream = (x – y) km/hr
and speed of boat down stream = x + y km/ hr

Hence speed of boat = 6 km/hr and speed streams = 2 km/hr

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