Pipes A and B can fill a tank in 8 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
Choose the correct choice from the following choices: A) 1 13/17 hours B) 2 8/11 hours C) 3 9/17 hours D) 4 4/5 hours E) None
Solution   Net part filled in 1 hour	= (1/8 + 1/6 -1/12)   = 5/24.   Therefore, the tank will be full in 24/5 hrs.	â€¹=â€º 4 4/5 hrs.   Answer 4 4/5 hours
<result>D</result>
Pipes A and B can fill a tank in 8 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