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 the correct choice from the following choices:
A) 87
B) 09
C) 40
D) 42
E) 76
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?