3 years ago in Time and Work

Two pipes A and B can fill a tank in 36 min. and 45 min. respectively. Another pipe C can empty the tank in 30 min. First A and B are opened. After 7 minutes, C is also opened. The tank filled up in:

[A] 39 min.
[B] 46 min
[C] 40 min.
[D] 45 min.
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