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Q)

Pipe A can fill a tank in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If all of them work together, find the time taken to fill the tank?


( A ) 10 1/7 minutes
( B ) 15 1/7 minutes
( C ) 17 1/7 minutes
( D ) 12 1/7 minutes

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