What is the correct answer?


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.

Correct Answer :

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.