Ravi can row a boat in still water at the speed of 14 km/h. If a river is flowing at the speed of 2 km/h and Ravi takes 3 hours to cover a certain distance upstream, then bow much time will he take to cover the same distance downstream?
Answer & explanation
Correct answer: option 3
Given that,
Speed of the boat = 14kmph
Flow of the river = 2kmph
Time taken = Ravi takes 3 hours to cover a certain distance upstream
Effective speed during the upstream journey = (14 - 2) kmph = 12kmph
Distance covered = 12 × 3 = 36 hours
Effective speed during the downstream journey = (14 + 2) kmph = 16 kmph
So, time taken by Ravi to cover 36 km downstream = 36 ÷ 16 = 2.25 hours = 2 hours 15 minutes