BOATS and STREAMS Q24

24.A man can row 10 kmph in still water and the river is running at 2 kmph. If the man takes 1 hr to row to a place and back, how far is the place?

[A] 4.8

[C] 5

[B] 4.5

[D] 5.6

Answer : [A]

Explanation :

Man’s rate downstream = (10 + 2) kmph = 12 kmph

Man’s rate upstream = (10 – 2) kmph = 8 kmph

Let the reqd. distance be x km

Then x + x  = 1 12 8

20x = 96

x = 4.8

Hence, the required distance is 4.8 km