Problema Solution
Sam can stain his deck in 9 hours, and his sister grace can stain the deck in 12 hours. How many hours would it take to stain the deck if they worked together?
Answer provided by our tutors
Stan's rate is 1/9 deck per hour.
Grace's rate is 1/12 deck per hour.
Let 'x' represent the hours the need to stain the deck together and x>=0.
The together rate is 1/x deck per hour.
1/9 + 1/12 = 1/x
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click here to see the equation solved for x
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x = 5.14 hr
It would take them 5.14 hours to stain the deck together.