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4. A man rows his boat 85 km downstream and 45 kmupstream, taking 2.30 hours each time. Find thespeed of the stream ?(A) 5 kmph(B) 6 kmph(C) 7 kmph(D) 8 kmph​

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Answer:

Answer:

Option D

Explanation:

Speed downstream = d/t = 85/(2 1/2) = 34 kmph

Speed upstream = d/t = 45/(2 1/2) = 18 kmph

The speed of the stream = (34 - 18)/2 = 8 kmph

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