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A boat goes 14 km upstream in 56 minutes. The speed of stream is 2 km/hr. The speed of boat in still water is?

6 km/hr
15 km/hr
14 km/hr
17 km/hr

Correct Answer: 17 km/hr

Explanation:

∵ Speed upstream = 14 x (60/56) = 15 km/hr
Speed in upstream = Speed in still water - Speed of stream.
⇒ x - 2 = 15
∴ x = 17 km/hr

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