In an hour a boat goes 10 Km along the stream and 4 Km against the stream. The speed of the boat in still water (in Kmph) is:

 In an hour a boat goes 10 Km along the stream and 4 Km against the stream. The speed of the boat in still water (in Kmph) is:

A). 1 Kmph

B). 3 Kmph

C). 7 Kmph

D). 11 Kmph

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