Pipe A can fill a tank in 4 hours, pipe B in 8 hours and pipe C in 8 hours. If all the pipes are open, in how many hours will the tank be filled?  Pick one: A) 2 B) 3 C) 4 D) 5 E) 6
Answer:	Part filled by A + B + C in 1 hour = 1/4 + 1/8 + 1/8= 1/2   All the three pipes together will fill the tank in 2 hours.   2nswer: 2
<result>A</result>
Pipe A can fill a tank in 4 hours, pipe B in 8 hours and pipe C in 8 hours. If all the pipes are open, in how many hours will the tank be filled?