A boat takes 38 hrs for travelling downstream from point p to point q and coming back to a point r midway between p and q. If the velocity of the stream is 8 km/hr and the speed of the boat in still water is 28 km/hr. What is the distance between p and q?

(A) 450 KM
(B) 510 KM
(C) 640 KM
(D) 720 KM

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