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Numerical Ability
Time Distance and Speed
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
4 kmph
5 kmph
6 kmph
7 kmph
Read Solution (Total 1)
-
- Rate upstream = (750/675) = 10/9 m/sec
Rate downstream (750/450) m/sec = 5/3 m/sec
since, 7 and half minutes = 7.5 minutes as, 1min = 60sec 7.5 min = 7.5*60 = 450 sec
Rate in still water = (1/2)*[(10/9) + (5/3)] m/sec.
= 25/18 m/sec
= (25/18)*(18/5) kmph
= 5 kmph - 7 years agoHelpfull: Yes(0) No(0)
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