Two pipes A and B can fill a tank in 25 hours and 35 hours respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank? Options:
A) 20 hours
B) 14 6/11 hours
C) 10 hours
D) 12 hours
E) 8 hours
Part filled by A in 1 hour = 1/25   Part filled by 14 6/11 hours in 1 hour = 1/30   Part filled by (A+14 6/11 hours) in 1 hour = 1/25 + 1/30 = 11/150   14 6/11 hoursoth the pipes together fill the tank in 150/11 = 14 6/11 hours   Answer is 14 6/11 hours
<result>B</result>
Two pipes A and B can fill a tank in 25 hours and 35 hours respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?