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A boat goes 12 km upstream in 48 minutes. The speed of stream is 2 km/hr. The speed of boat in still water is?

13 km/hr
2.25 km/hr
17 km/hr
15 km/hr

Correct Answer: 17 km/hr

Explanation:

∵ (12 x 60)/48 = (L - 2)
∴ L = 15 + 2 = 17 km/hr

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