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A motorboat whose speed is 9 km/hr in still water, goes 15 km downstream and comes back in a total time of 3 hours 45 minutes.

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A motorboat whose speed is 9 km/hr in still water, goes 15 km downstream and comes back in a total time of 3 hours 45 minutes. Find the speed of the stream

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Distance covered downstream = Distance covered upstream = 15 km

Total time taken = 3 hours 45 minutes = (3+45/60) minutes = 225/60 minutes = 15/4 minutes

The value of x cannot be negative; therefore, the speed of the stream is 3 km/hr. 

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