Two pipes A and B can fill a cistern in $37\frac{1}{2}$ minutes and 45 minutes respectively. Both pipes 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 $37\frac{1}{2}$ minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled just in half an hour, If the pipe B is turned off after :
1). 15 minutes
2). 10 minutes
3). 5 minutes
4). 9 minutes

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