SOLUTION: if a man clear a plot of land at 3 hours, another man clear a plot of land at 5 hours and another man clear a plot of land at 7 hours, how many hours will it take 3 of the men to c

Question 926787: if a man clear a plot of land at 3 hours, another man clear a plot of land at 5 hours and another man clear a plot of land at 7 hours, how many hours will it take 3 of the men to clear one plot of land
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
r = w/t
rates are additive:
1/3 + 1/5 + 1/7 = 0.6761904762
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t = w/r
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t = 1 / 0.6761904762
t = 1.47887323944 hours
t = 1 hour 0.47887323944 * 60 minutes
t = 1 hour 28.7 minutes
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