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
Choices:
A) 13 km/hr. B) 6 km/hr. C) 9 km/hr. D) 15 km/hr. E) 11 km/hr.
Let man’s rate upstream be x kmph.then ,his rate downstream=3xkmph.   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.   Answer is 9 km/hr..
<result>C</result>
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