Question 512923
It takes Sara 2 hours to paint a fence and Daniel 4 hours to paint the same fence. How long will it take to paint the fence if they work together?
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Sara rate: 1/2 job/hr
Dan rate:: 1/4 job/hr
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Together rate: 1/x job/hr
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Equation:
rate + rate = together rate
1/2 + 1/4 = 1/x
Multiply thru by 4x to get:
2x + x = 4
3x = 4
x = 3/4 hr. (time to do the job together)
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Cheers,
Stan H.
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