CAT Preparation - Pipes and Cisterns Question 01

Описание: Question: Pipes A, B and C can fill a tank in 30, 60 and 120 minutes respectively. Pipes B and C are kept open for 10 minutes, and then Pipe B is shut while Pipe A is opened. Pipe C is closed 10 minutes before the tank overflows. How long does it take to fill the tank?
(a) 40 minutes
(b) 28 minutes
(c) 30 minutes
(d) 36 minutes

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