Pipes A, B and C can fill a tank in 30 h, 40 h and 60 h 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?

Pipes A, B and C can fill a tank in 30 h, 40 h and 60 h respectively.

1.	Pipes A, B and C can fill a tank in 30 h, 40 h and 60 h 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.	9:40 p.m
B.	10:00 p.m
C.	9:20 p.m
D.	10:20 p.m
Answer» D. 10:20 p.m

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Pipes A, B and C can fill a tank in 30 h, 40 h and 60 h 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?

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