SOLUTION: If David finish a roof in 9 hours and Kevin finish a roof in 6 hours.how long would it take if they work together?
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You can put this solution on YOUR website! If David finish a roof in 9 hours and Kevin finish a roof in 6 hours.
how long would it take if they work together?
:
let t = time required when working together
let the completed job = 1
:
A typical shared work equation, each will do a fraction of the job, the two fractions add up to 1 + = 1
multiply equation by 18, cancel the denominators and you have
2t + 3t = 18
5t = 18
t = 18/5
t = 3.6 hrs working together
