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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`

B

`10:20`

C

`9:20`

D

`9:40`

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Two pipes A and B can fill a tank in 16 hours and 20 hours respectively. They are opened alternatively for 1 hour each, starting with pipe A first. In how many hours with the empty tank be filled ? दो पाइप A और B किसी टंकी को क्रमशः 16 और 20 घंटे में भर सकते हैं | पाइप A से शुरुआत करते हुए उन्हें 1 घंटे के लिए एक के बाद एक करके खोला जाता है | खाली टंकी कितने घंटों में भर जायेगी ?

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