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?
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