Two pipes A and B work alternatively with a third pipe C to fill a swimming pool. Working alone, A, B and C require 10, 20 and 15 hours respectively. Find the total time required to fill the pool.
(A) 7 hours 14 minutes
(B) 6 hours 54 minutes
(C) 5 hours 14 minutes
(D) 8 hours 54 minutes

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