A cistern is normally filled in 14 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? Choices
A) 33  B) 88  C) 40  D) 99  E) 112

Rationale: "1 / 14 - 1 / x = 1 / 16 x = 112 answer : e"
Answer: E