Two pipes A and B can separately fill a tank in 2 hours

Two pipes A and B can separately fill a tank in 2 hours and 3 hours respectively. If both the pipes are opened simultaneously in the empty tank, then the tank will be filled in

1. 1 hour 12 minutes
2. 2 hours 30 minutes
3. 1 hour 15 minutes
4. 1 hour 20 minutes

On the basis of given details in question ,

Part of tank filled by pipes A and B in 1 hour =	1	+	1	=	3 + 2	=	5	part
	2		3		6		6

∴ Required time =	6	hours
	5

Required time = 1 hour	1	× 60
	5

Required time = 1 hour 12 minutes