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Question -

A boat goes 24 km upstream and 28 km downstream in 6 hrs. It goes 30 km upstream and 21 km downstream in 6 hrs. Find the speed of the boat in still water and also speed of the stream.



Answer -

Let the speed of boat = x km/hr
and speed of stream = y km/hr
In first case,
Distance covered upstream = 24 km
and down stream = 28 km
Total time taken = 6 hours
In second case,
Distance covered upstream = 30 km
and downstream = 21 km
Total time taken = 6  = 13/2 hrs.

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