Pipes A and B can fill a tank in 4 and 8 hours respectively. Pipe C can empty it in 16 hours. If all the three pipes are opened together, then the tank will be filled in?	Options:
A) 3 9/97 hrs
B) 3 1/5 hrs
C) 3 9/17 hrs
D) 3 9/27 hrs
E) 3 9/19 hrs
Net part filled in 1 hour = 1/4 + 1/8 - 1/16   = 5/16   The tank will be full in 16/5 hrs, i.e., 3 1/5 hrs.   Answer:3 1/5 hrs
<result>B</result>
Pipes A and B can fill a tank in 4 and 8 hours respectively. Pipe C can empty it in 16 hours. If all the three pipes are opened together, then the tank will be filled in?