A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

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Question: A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?
[A].

4 km/hr

[B].

6 km/hr

[C].

8 km/hr

[D].

Data inadequate

Answer: Option B

Explanation:

Rate downstream = 16 kmph = 8 kmph.
2
Rate upstream = 16 kmph = 4 kmph.
4
Speed in still water = 1 (8 + 4) kmph = 6 kmph.
2

Video Explanation: https://youtu.be/3D8uAfzz3l0