Boats & Streams Mcqs

Q.  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?

a. 8 kmph
b. 4 kmph
c. 2 kmph
d. 10 kmph


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