Questions :
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 what 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 :
Options :
- 42 hours
- 45.5 hours
- 49 hours
- 38.5 hours
correct answer : c)
