Pipes A B and C can fill a tank in 20...

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Pipes A, B and C can fill a tank in 20, 30 and 60 hours, respectively. Pipes A, B and C are opened at 7 a.m., 8 a.m. and 9 a.m., respectively, on the same day. When will the tank be full?

A. 4:40 p.m.

B. 6:40 p.m.

C. 7:20 p.m.

D. 5:40 p.m.

Answer: Option D

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