Quantitative Aptitude Time and Work Pipe and Cistern

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?

1
4 ∶ 40 p.m.
2
5 ∶ 40 p.m.
3
6 ∶ 20 p.m.
4
7 ∶ 20 p.m.

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