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A swimming pool has 3 drain pipes A, B and C. The pipes A and B, working simultaneously, can empty the pool in half the time taken by pipe C. Pipe A, working alone, takes half the time taken by pipe B. All together they take 6 hour 40 minutes to empty the pool. Time taken by pipe A to empty the pool is–
(a) 15 hours
(b) 10 hours
(c) 30 hours
(d) 7 hours
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ssc cgl tier 1