Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:

1.

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:

[A].	1 13/17 hours
[B].	2 8/11 hours
[C].	3 9/17 hours
[D].	4 1/2 hours

Answer: Option C

Explanation:

Net part filled in 1 hour		1	+	1	-	1		=	17	.
		5		6		12			60

The tank will be full in	60	hours i.e., 3	9	hours.
	17		17

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