A boat goes 13 km upstream (against current) in 39 minutes. The speed of stream (current) is 3 km/hr. What is the speed of the boat in still water?

A boat goes 13 km upstream (against current) in 39 minutes. The speed of stream (current) is 3 km/hr. What is the speed of the boat in still water?

A 23 km/hr

B 27 km/hr

C 17 km/hr

D 20 km/hr

Solution

Correct Answer: Option A

B-C = 60*13/39 =20km/hr

C = 3km/hr

SO, B =20+3 = 23kmph