A man whose speed is 4.5 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph, find his average speed for the total journey?

Basic Maths Mcqs Boats and Streams 11/09/2021

A. 8 kmph
B. 4 kmph
C. 2 kmph
D. 10 kmph

Explanation:

M = 45
S = 1.5
DS = 6
US = 3
AS = (2 * 6 * 3) /9 = 4

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