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A boat takes 19 hours for travelling downstream from point A to point B and coming back to a point C midway between A and B. If the velocity of the stream is 4 kmph and the speed of the boat in still water is 14 kmph, what is the distance between A and B? `160\ k m` b. `180\ k m` c. `220\ k m` d. `200\ k m`

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