Question

A boat is moving 2 km against the current of the stream in 1 hour and moves 1 km in the direction of the current in 10 minutes. How long will it take the boat to go 5 km in stationary water?

• A. 1 hr 20 minutes
• B. 1 hr 30 minutes
• C. 1 hr 15 minutes
• D. 30 minutes

Answer 1

Answer:

C. 1 hr 15 minutes

Downstream = (1/10 × 60) = 6 km/hr Upstream = 2 km/hr Speed in still water = ½ (6+2) = 4 km/hr So, the time is taken by the boat to go 5km in stationary water = 5/4 hrs = 1 ¼ hrs = 1 hr 15 minutes