Q. Three pipes A, B and C can fill a tank in 12 hours. After working together for 3 hours, C is closed and A and B can fill the remaining part in 16 hours, then find the time taken ...

Correct Answer: 11 Explanation: (25*75*125)*128*(50*100*150) =(5*5*3*5*5*5*5*5)*(2*2*2*2*2*2*2)*(50*100*150) = Pair of (2*5) = 7 zeros and remaining 4 zeros Total = 11 zeros

## Navya

Correct Answer: 27 (3/7) hrs Explanation: Let capacity of tank = 12 lit A+B+C per hr = 12/12 = 1 In 3 hrs = 1*3 = 3 Remaining = 12-3 = 9 lit Filled by A+B in 16 hrs Efficiency of A +B = 9/16 Efficiency of C = 1 - 9/16 = 7/16 C will fill full tank in = 12/(7/16) = 192/7 = 27(3/7) hrs