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:

[A].	60 gallons
[B].	100 gallons
[C].	120 gallons
[D].	180 gallons

Answer: Option C

Explanation:

Work done by the waste pipe in 1 minute =	1	-		1	+	1
	15			20		24

=		1	-	11
		15		120

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

Volume of	1	part = 3 gallons.
	40

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

Aptitude :: Pipes and Cistern : More Exercises

Pipes and Cistern- General Questions

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:

Aptitude :: Pipes and Cistern : More Exercises

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