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A boat P travels 40 km upstream from point A to B in 10 hours and from point B to A downstream in 5 hours. Another boat Q can travel from point A to a point C 30 km upstream in 5 hours. At 10 am, P starts from A and goes towards B. At the same time, Q starts from C and proceeds towards A. At what distance from B will they meet each other? (A) 31.4 km (B) 32.5 km (C) 32.9 km (D) 33.4 km (E) None of these