A cistern which could be filled in 9 hours takes one hour more to be filled owing to a leak in its bottom. If the cistern is full, in what time will the leak empty it?
A. 19 hours
B.1 hour
C.90 hours
D.35
hours
A cistern which could be filled in 9 hours takes one hour more to be filled owing to a leak in its bottom. If the cistern is full, in what time will the leak empty it?
A. 19 hours
B.1 hour
C.90 hours
D.35
hours










