1.  Ravi and Kumar are working on an assignment. Ravi takes 6 hours to type 32 pages on a computer, while Kumar 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

Answer: Option C

Explanation:

Number of pages typed by Ravi in 1 hour

= 32 = 16 .
6 3

Number of pages typed by Kumar in 1 hour

= 40 = 8.
5

Number of pages typed by both in 1 hour

= ( 16 + 8 ) = 40 .
3 3

Therefore Time taken by both to type 110 pages

= ( 110 x 3 ) hours
40

= 8 1 hours (or) 8 hours 15 minutes.
4