Question: Three pipes A, B and C can fill a cistern in 10, 12, and 15 hours respectively, when working alone. If all the three

Three pipes A, B and C can fill a cistern in 10,

Three pipes A, B and C can fill a cistern in 10, 12, and 15 hours respectively, when working alone. If all the three pipes are opened together, then the times taken to fill the cistern will be? 1. 4 hours 2. 6 hours 3. 7 hours 4. 5 hours None of these 5.

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