A man can row at 5 km/hr in still water and the velocity

Home » Aptitude » Boats and Streams » Question

A man can row at 5 km/hr in still water and the velocity of current is 1 km/hr. It takes him 1 hour to row to a place and back. How far is the place ?

1. 2.5 km
2. 2.4 km
3. 3 km
4. 3.6 km

Correct Option: B

Speed downstream = (5 + 1) km/hr = 6 km/hr
Speed upstream = (5 - 1) km/hr = 4 km/hr
Let the required distance be d km
Then, d/6 + d/4 = 1
⇒ 2d + 3d = 12
∴ d = 2.4 km