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A boat goes 40 km. upstream in 8 hours and 36 km. downstream in 6 hours. The speed of the boat in standing water is?

6.5 km.hr
6 km/hr
5.5 km/hr
5 km/hr

Correct Answer: 5.5 km/hr

Explanation:

Speed upstream = (40/8) km/hr = 5 km/hr
Speed downstream = (36/6) km/hr = 6 km/hr
Speed of boat in still water = (5 + 6)/2 km/hr = 5.5 km/hr.

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