A boat's speed in still water is 5km/h. While river is flowing with a speed of 2km/h and time taken to cover a certain distance upstream is 2 h more than time taken to cover the same distance downstream. Find the distance?

10.5 km
11 km
10.9 km
15 km

Correct Answer: 10.5 km

Explanation:

Let the distance be D km.
Speed download = (5 +2) = 7 km/h
and speed upstream = (5 -2) = 3 km/h
According to the question,
D/3 - D/7 = 2
⇒ 7D - 3D = 21 x 2
∴ D = (21 x 2)/4 = 10.5 km

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