A man can row 18km/hr in still water. It takes him thrice as long to row up as to row up as to row down the river then the rate of stream is
(1) 6km/hr
(2) 9km/hr
(3) 27km/hr
(4) 3 km/hr
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Let man’s rate upstream be x kmph. then his rate downstream =3x kmph. So 2x=18 or x=9. Rate upstream=9 km/hr rate downstream=27 km/hr. Hence rate of stream=1/227-9km/hr=9 km/hr.
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