Two pipes A and B can fill a tank with water in 24 minutes and 30 minutes respectively. The third pipe C can empty the tank in 40 minutes. First A and B are opened. After _______ C is opened. If the Remaining tank will be filled up in next 15 minutes.
1
4 minutes
2
\(3\frac{1}{3}\;minutes\)
3
\(2\frac{1}{3}\;minutes\)
4
3 minutes
5
None of these