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OpenStudy (anonymous):
It takes Tom 4 hours to paint the fence and it takes his brother, Bobby 8 hours to paint the same fence. how long would it take thaem to paint the fence together
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OpenStudy (bme89):
2.66 hours. Can someone confirm? Tom paints at 0.25 fences/hour, Bobby at 0.125 fences/hour. Together at 0.375 fences/hour. (1 fence)/(0.375 fences/hour) = 2.66 hours
OpenStudy (anonymous):
working together they paint 3/8 of fence in 1 hour so whole fence takes 8/3 - 2 2/3 hors or 2 hours 40 minutes
OpenStudy (anonymous):
correct bme
OpenStudy (anonymous):
thanks
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