Use reasoning to answer the following question.
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:\nOptions:\n(A) 3\n(B) 4\n(C) 5\n(D) 8\n(E) 9

(D)
Speed in still water = (11 + 5)/2 kmph = 8 kmph.

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So, the answer is (D)