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It takes 5 hours for 3 guys to paint a house. The 3 guys paint for 3 hours and then 3 more guys help finish the house. How much time is saved and why?
Wiki User
∙ 15y ago
One hour is saved. The three guys need two more hours to finish. If three more guys help them, it will cut the time in half. 3 guys * 5 hours = 1 house painted guy * hour = 1 hour of labor So it would take 15 hours of labor to paint a house. We need to assume houses take the same time to paint and each guy works at the same rate. 3 guys * 3 hours = 9 hours of labor 9 hours of labor + (3+3) guys * x hours = 15 hours of labor 9 + 6x = 15 x=1 Total time = 3 hours of 3man + 1 hour of 6 man = 4 hours time saved = 5-4 = 1 hour
Wiki User
∙ 15y ago
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