Ronald and Elan are working on an assignment. Ronald takes 6 hours to type 32 pages on a computer, while Elan takes 5 hours to type 40 pages. How much time will they take, working together on two different computers to type an assignment of 110 pages?
Choose the correct choice from the following answers
A) 3 hours B) 6 hours C) 4 hours D) 8 hours E) 10 hours

Rationale: number of pages typed by ronald in one hour = 32 / 6 = 16 / 3 number of pages typed by elan in one hour = 40 / 5 = 8 number of pages typed by both in one hour = ( ( 16 / 3 ) + 8 ) = 40 / 3 therefore , time taken by both to type 110 pages = 110 x 3 / 40 = 8 hours . answer : d
Answer: D