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

Pipes A, B and C can fill a tank in 30h, 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?
पाइप A, B और C किसी टंकी को क्रमशः 30, 40 और 60 घंटों में भर सकते हैं | पाइप A, B और C को एक ही दिन क्रमशः सुबह 7, 8 और 10 बजे चालू किया जाता है | टंकी किस समय भर जाएगी ?

A

10.00 p.m.

B

10.20 p.m.

C

9.20 p.m.

D

9.40 p.m.

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