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 ?
[A]7 hours 30 minutes
[B]8 hours
[C]8 hours 15 minutes
[D]8 hours 25 minutes

8 hours 15 minutes
Ronald’s 1 hour’s work $= \frac{32}{6}=\frac{16}{3}\ pages$
Pages typed in 6 hrs. = 32, Pages typed in 1 hr $= \frac{32}{6}$
Elan’s 1 hour’s work = 8 pages
1 hour’s work of the both $= \frac{16}{3}+8 = \frac{40}{3}\ pages$
∴ Required Time $= \frac{110\times 3}{40} = \frac{33}{4}\ hours = 8\ hours\ 15\ minutes$
Hence option [C] is correct answer.