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:

Question

Accepted Answer

Work done by the waste pipe in 1 minute = 1 - ❨ 1 + 1

=	❨	1	-	11	❩
		15		120

= -	1	. [-ve sign means emptying]
	40

∴ Volume of	1	part = 3 gallons.
	40

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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