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Two pipes A and B can fill a tank in 36 ...

Two pipes A and B can fill a tank in 36 min and 45 min, respectively. A pipe 'C' can empty the tank in 30 min. If all the three pipes are opened simultaneously, then in how much time the tank will be completely filled?

A

6 h

B

1 h

C

3 h

D

4 h

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Verified by Experts

The correct Answer is:
B
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