A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in? Choose one:
A) 27
B) 29
C) 40
D) 89
E) 22
1/8 - 1/x = 1/10   x = 40   Answer: 40
<result>C</result>
A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in?