Ajay can row his boat in still water, at a speed of 11 km/hr. If the speed of the stream is 7 km/hr, how long will it take to a distance of 54 km downstream?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 3 hours.
Speed of the boat in still water = 11 km/h
Speed of stream = 7 km/h
Speed of the boat in downstream = 11 + 7 = 18 km/h
Total time taken to cover 54 km downstream = Total distance/speed
= 54/18
= 3 hours