Question

Two pipes A and B fill a tank in certain time and tap c will empty the full tank in 60 minutes.If all three r open how much time it take to fill an empty tank?​

Answer 1

Answer:

If Pipe A started the sequence of filling alternately, then at the end of two hours, the two pipes together would have filled 1/40 + 1/120 = 1/30 th of the tank in an hour. Or the cistern will fill in 30 hours.

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