A pipe can fill a cistern in 18 hours. Due to a leak in its bottom, the cistern fills up in 20 hours. If the cistern is full, in how much time will it be emptied by the leak?
1
170 hours
2
180 hours
3
190 hours
4
200 hours
A pipe can fill a cistern in 18 hours. Due to a leak in its bottom, the cistern fills up in 20 hours. If the cistern is full, in how much time will it be emptied by the leak?