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Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:

Correct Answer: 120 gallons

Explanation:

Work done by the waste pipe in 1 minute = 1 15 - 1 20 + 1 24 = 1 15 - 11 120   =   - 1 40  [-ve sign means emptying]


 


Volume of  1 40 part = 3 gallons


 


Volume of whole = (3 x 40) gallons = 120 gallons.


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