Lino can painta door in 6 hours while Eddie can do the same in 3 hours. How long will it take them to paint a door if they work together?

"Same job: 1

Time to finish the job when working together: x

Work Rate when working together: 1/x

Lino's work rate: 1/6

Eddie's work rate: 1/3

Equation:

1/6 + 1/3 = 1/x

LCD: 6x

6x [1/6 + 1/3 = 1/x  ] 6x

x + 2x = 6

3x/3 = 6/3

x = 2

ANSWER: 2 hours"

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