Calculate the speed of a boat in still water (in km/hr) if in one hour, the boat goes 10 km/hr downstream and 4 km/hr upstream.\nOptions:\n(A) 7 kmph\n(B) 8 kmph\n(C) 9 kmph\n(D) 7 kmph\n(E) 6 kmph OK. Let's think. Some random thoughts first:
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Speed in still water = (10 + 4)1/2 kmph = 7 kmph. The answer: (A).
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