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Two pipes A and B can fill a tank in 3 h...

Two pipes A and B can fill a tank in 3 hours and 3 hours 45 minutes respectively. Third pipe C can empty the tank in 1 hour. All the three pipes are opened together when the tank is half filled. In how much time the tank will be emptied.

A

75 min.

B

50 min.

C

60 min.

D

45 min.

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The correct Answer is:
A
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