A man rows downstream 32 km and 14 km upstream. If he takes 6 hours to cover each distance, then the velocity (in kmph) of the current is:

A. 1.5 kmph
B. 1.75 kmph
C. 2 kmph
D. 3 kmph
Ans: A

Explanation:

Rate downstream = [32/6] kmph; Rate upstream = [14/6] kmph.
=> Velocity of current = 1/2[32/6 - 14/6] kmph
                                  = 3/2 kmph
                                  = 1.5 kmph