1. Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is:

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By: guest on 01 Jun 2017 05.47 pm

Part filled in 2 hours = 2 = 1 6 3 Remaining part = 1 - 1 = 2 . 3 3 (A + B)'s 7 hour's work = 2 3 (A + B)'s 1 hour's work = 2 21 C's 1 hour's work = { (A + B + C)'s 1 hour's work } - { (A + B)'s 1 hour's work } = 1 - 2 = 1 6 21 14 C alone can fill the tank in 14 hours.