Question

In a stream that is running at 2 km/h, a man goes 10 km upstream and comes back to the starting point in 55 minutes. Find the speed of the man in still water.

• A. 20 km/h
• B. 22 km/h
• C. 24 km/h
• D. 28 km/h

Answer 1

The correct option is B 22 km/h

$\frac{10}{S_B-2}+\frac{10}{S_B+2}=\frac{55}{60}=\frac{11}{12}\cdots \left(i\right)\text{On solving e.g. (i) we get,}{S}_B=22km/hr$