Question

Pipes A and B can fill a tank in 10 hours and 40 hours, respectively. C is an outlet pipe attached to the tank. If all the three pipes are opened simultaneously, it takes 80 minutes more time than A and B together take to fill the tank. A and B are kept opened for 7 hours and then closed and C was opened. C will now empty the tank in:

• A. 42 hours
• B. 49 hours
• C. 45.5 hours
• D. 38.5 hours

Answer 1

Answer: (B)