Question :
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?
1. 15 1/7 minutes
2. 12 1/7 minutes
3. 17 1/7 minutes
4. 10 1/7 minutes
Answer :
3 - 17 1/7 minutes
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