a man can row 18 kmph in still water.it takes him thrice as long to row up as to row down the river. Find the rate of stream.
A. 6 km/hr.
B. 7 km/hr.
C. 8 km/hr.
D. 9 km/hr.
x=18 or x=9.
Rate upstream=9 km/hr, rate downstream=27 km/hr.
Hence, rate of stream=1/2(27-9)km/hr=9 km/hr.
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