Two pipes A and B can fill a tank in 14 and 21 hrs respectively. If both pipes are opened together then after how many hours A should be closed so that tank is full in 7 hours.

Two pipes A and B can fill a tank in 14 and 21 hrs respectively. If bo

1.	Two pipes A and B can fill a tank in 14 and 21 hrs respectively. If both pipes are opened together then after how many hours A should be closed so that tank is full in 7 hours.
A.	28/5 hrs
B.	6.5 hrs
C.	5 hrs
D.	4 hrs
Answer» B. 6.5 hrs

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Two pipes A and B can fill a tank in 14 and 21 hrs respectively. If both pipes are opened together then after how many hours A should be closed so that tank is full in 7 hours.

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