Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

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Accepted Answer

Part filled by A in 1 min = 1 . 20 …

Part filled by (A + B) in 1 min =	❨	1	+	1	❩	=	1	.
		20		30			12

Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

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