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?	Answers.
A) 27 B) 20 C) 40 D) 73 E) 72
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?