A boat covers a distance of 55 km downstream in 5 hours while it takes 11 hours to cover the same distance upstream. What is the speed of the boat?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 8 km/h.
Downstream speed = 55/5 = 11 km/h
Upstream speed = 55/11 = 5 km/h
Speed of boat = (11 + 5)/2 = 16/2 = 8 km/h
Therefore, the boat's speed in still water is 8 km/h.