Problema Solution
Working alone, Mandi can complete a project in 7 hours. It would take Colin 3 hours to complete the same project. If they work together, how long will it take them to complete the project?
Answer provided by our tutors
let x = the hours to complete the project together
1/7 + 1/3 = 1/x
by solving we find
x = 2.1 h
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