Problema Solution
It takes one person 4 hours to proofread an article. If a second person is added, it takes both of them 2.5 hours to do it. How long would it take the second person to do it alone?
Answer provided by our tutors
let 'x' represent the time it would take the second person to proofread an article on their own
1/2.5 = 1/4 + 1/x
solving for 'x' we have x=6 2/3
it would take the second person 6 2/3 hours (6.67 hours) to proofread an article on their own