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.
Let man’* 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.
