Two pipes A and B can Gil a tank in 36 min. and 45 min. respectively. A water pipe C can empty the tank in 30 min. First A and B are opened. After 7 minutes, C is also opened. In how much time, the ta

Two pipes A and B can Gil a tank in 36 min. and 45 min. respectivel

1.	Two pipes A and B can Gil a tank in 36 min. and 45 min. respectively. A water pipe C can empty the tank in 30 min. First A and B are opened. After 7 minutes, C is also opened. In how much time, the ta
A.	30 minutes
B.	40 minutes
C.	46 minutes
D.	39 minutes
Answer» D. 39 minutes

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Two pipes A and B can Gil a tank in 36 min. and 45 min. respectively. A water pipe C can empty the tank in 30 min. First A and B are opened. After 7 minutes, C is also opened. In how much time, the ta

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