X can row at a speed of 18 kmph in still water.If it takes him thrice as long to row up as to row down the river.Find the rate of stream:
none of the above
Let X’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 = 1/2(27-9)km/hr = 9 km/hr.
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