SOLUTION: Bert can clean the sidewalks around the building in 2 hours in using a blower. Dennis can do the same job in 8 hours in using a broom. How long would it take them working together?
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Question 907353: Bert can clean the sidewalks around the building in 2 hours in using a blower. Dennis can do the same job in 8 hours in using a broom. How long would it take them working together?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
1/a+1/b=1/x
1/2+1/8=1/x
8/16+2/16=1/x
10/16=1/x
x=16/10
x=1.6 hours working together
check
x/a+c/b=1
1.6/2+1.6/8=1
.8+.2=1
1=1
ok
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