Pipes A B and C can fill a tank in 30h...

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Pipes A, B and C can fill a tank in 30h, 40h and 60h respectively. Pipes A, B and C are opened at 7 a.m., 8 a.m., and 10 a.m., respectively on the same day. When will the tank be full?

A. 10.00 pm

B. 9.20 pm

C. 10.20 pm

D. 9.40 pm

Answer: Option B

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