Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours. C is closed A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is?
Q1. Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours. C is closed A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is?
Answer: 14
Explanation: Together fill 1/3 in 2 hrs; remaining 2/3 filled by A+B in 7 hrs → A+B rate = 2/21; C rate = 1/6 − 2/21 = 1/14; C alone takes 14 hrs.