Two faucet A and B can fill a tank in 20 hours and 40 hours respectively. If they are openedsimultaneously. Sometimes later, tap B was closed, then it takes total 14 hours to fill up the whole tank. Afterhow many hours B was closed?

Two faucet A and B can fill a tank in 20 hours and 40 hours respective

1.	Two faucet A and B can fill a tank in 20 hours and 40 hours respectively. If they are openedsimultaneously. Sometimes later, tap B was closed, then it takes total 14 hours to fill up the whole tank. Afterhow many hours B was closed?
A.	4 hrs
B.	12 hrs
C.	15.2 hrs
D.	17.6 hrs
Answer» B. 12 hrs

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Two faucet A and B can fill a tank in 20 hours and 40 hours respectively. If they are openedsimultaneously. Sometimes later, tap B was closed, then it takes total 14 hours to fill up the whole tank. Afterhow many hours B was closed?

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