A boat goes 48 km downstream in 20 h. It takes 4 h more to cover the same distance against the stream. What is the speed of the boat in still water?

2.2 km/h
2 km/h
4 km/h
4.2 km/h

Correct Answer: 2.2 km/h

Explanation:

Speed downstream = 48/20 = 2.4 km/h
Speed upstream = 48/24 = 2 km/h
∴ Speed of boat in still water = (Speed downstream + Speed upstream)/2
= (2.4 + 2)/2 = 4.4/2 = 2.2 km/h

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