In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
3 km/hr
5 km/hr
8 km/hr
9 km/hr
Explanation:
Speed in still water = 1/2= (11 + 5) kmph = 8 kmph.
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