Two pipes A and B can fill a cistern in 371 minutes and 45 minutes respectively. Both 2pipes are opened.The cistern will be filled just in half an hour, if the pipe B is turned off after :

Two pipes A and B can fill a cistern in 371 minutes and 45 minutes res

1.	Two pipes A and B can fill a cistern in 371 minutes and 45 minutes respectively. Both 2pipes are opened.The cistern will be filled just in half an hour, if the pipe B is turned off after :
A.	15 minutes
B.	10 minutes
C.
D.	5 minutes
E.	9 minutes
Answer» E. 9 minutes

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