Question: Calculate the speed of a boat in still water (in km/hr) if in one hour, the boat goes 13 km/hr downstream and 10 km/hr upstream.\nOptions:\n(A) 3 kmph\n(B) 9 kmph\n(C) 4 kmph\n(D) 8 kmph\n(E) 6 kmph Let's think first. Some random reasoning:
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Speed in still water = (13 + 5)1/2 kmph = 9 kmph. The final answer: (B).
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