Multiple choice

A boatman goes 2 km against the stream in 1 hour and 1 km with the stream in 10 minutes. He will cover a distance of 5 km in still water in

  1. 1 hour

  2. 1 hour 15 minutes

  3. 1(1/2) hour

  4. 40 minutes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Against stream: 2 km in 1 hr = 2 km/hr. With stream: 1 km in 10 min = 6 km/hr. Still water speed = (6 + 2)/2 = 4 km/hr. Time for 5 km in still water = 5/4 = 1.25 hr = 1 hr 15 min. Option B is correct.

Keep practicing — related questions