<u>Answer</u>:
It takes 10 minutes for Jonathan, Susan and jack to type the document
<u>Step-by-step explanation:</u>
Given:
Time Taken by Jonathan to type 20 page document=40 minutes
Time Taken by Susan to type 20 page document=30 minutes
Time Taken by Jack to type 20 page document= 24 minutes
To Find:
Total time taken if all three type together=?
Solution:
Number of pages Jonathan can type in 1 min = = pages
Similarly, Number of pages Susan can type in 1 mi = = pages
Similarly, Number of pages Jack can type in 1 mi = = pages
So, if they all work together then
no. Of pages they can type in 1 min = + + =2 pages
no. Of pages they can type in 1 min =0.5+0.6+0.8
no. Of pages they can type in 1 min = 2 pages
So, they can type 20 pages in = =10 min