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:
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Work done by the waste pipe in 1 minute =1/15-1/20+1/15
=1/15-11/20
= - 1/40
Volume of1/40part = 3 gallons.
Volume of whole = (3 x 40) gallons = 120 gallons.
=1/15-11/20
= - 1/40
Volume of1/40part = 3 gallons.
Volume of whole = (3 x 40) gallons = 120 gallons.
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