A boat covers a distance of 30 km downstream in 2 hours and the same distance upstream in 3 hours. Find the speed of the boat in still water.
Show answer & explanation
Correct answer: B
Explanation
Speed downstream = 30/2 = 15 km/h
Speed upstream = 30/3 = 10 km/h
According to the formula:
Speed in still water = (Downstream + Upstream)/2
= (15 + 10)/2
= 25/2
= 12.5 km/h