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Pipes A and B can fill a tank in 12 hour...

Pipes A and B can fill a tank in 12 hours and 16 hours respectively and pipe C can empty the full tank in 24 hours. All three pipes are opened together, but after 4 hours pipe A is closed. In how many hours from the beginning the tank be filled?
पाइप A और पाइप B किसी टंकी को क्रमशः 12 घंटे एवं 16 घंटे में भर सकते हैं जबकि पाइप C भरी हुई टंकी को 24 घंटों में खाली कर सकता है | इन तीनों पाइप को एक साथ चालू कर दिया जाता है तथा 4 घंटे बाद पाइप A बंद कर दिया जाता है | टंकी को भरने में कुल कितने घंटे लगेंगे ?

A

24

B

28

C

30

D

32

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