66.
A cistern is two-third full of water. Pipe A can fill the remaining part in 12 minutes and pipe B in 8 minutes. Once the cistern is emptied, how much time will they take to fill it together completely?
A:
12 min, 12 sec
B:
14 min, 24 sec
C:
10 min, 12 sec
D:
14 min, 40 sec
The answer is:
B
