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Discussion :: Time and Work

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?
2.  A. 7 hours 30 minutes B. 8 hours C. 8 hours 15 minutes D. 8 hours 25 minutes

Explanation :

Number of pages typed by Ravi in 1 hour =$$\frac { 32 } { 6 }$$=$$\frac { 16 } { 3}$$

Number of pages typed by Kumar in 1 hour =$$\frac {40 } { 5 }$$=8

Number of pages typed by both in 1 hour =[$$\frac {16 } { 3 }$$+8]=$$\frac {40 } { 3 }$$

Time taken by both to type 110 pages =[110$$*\frac {3 } {40 } ]$$hours

8$$\frac { 1 } { 4 }$$hours (or) 8 hours 15 minutes

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