Question

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:

Medium

Solution

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Correct option is A)

Let the speed of the stream be
Speed downstream
Speed upstream
Distance travelled downstream
Distance travelled upstream
Time upstream
Time upstream
Time downstream
Time downstream
Total time taken
Hence the correct option is (B).

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