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A man rows 750 m in 675 seconds against the stream and returns in 7 and half minutes.
Question 1:
A man rows 750 m in 675 seconds against the stream and returns in 7 and half minutes. His rowing speed in still water is
A.
4 kmph
B.
5 kmph
Feedback
Rate upstream = (750/675) = 10/9 m/sec
Rate downstream (750/450) m/sec = 5/3 m/sec
Rate in still water = (1/2)*[(10/9) + (5/3)] m/sec.
25/18 m/sec =(25/18) × (18/5) kmph = 5 kmph
C.
6 kmph
D.
7 kmph
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