Problema Solution
Bert can clean the sidewalks around the building in 2 hours by using a blower. Dennis can do the same job in 8 hours using a broom. How long would it take them working together?
Answer provided by our tutors
Bert's rate is 1/2 sidewalks per hour.
Dennis's rate is 1/8 sidewalks per hour.
Let 'x' represent the number of hours that Bert and Dennis need to clean the sidewalk together.
The together rate is 1/x sidewalks per hour.
1/2 + 1/8 = 1/x
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click here to see the equation solved for x
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x = 1.6 hr
x = 1 hr 0.6*60 min
x = 1 hr 36 min
It will take them 1 hour and 36 minutes to finish the job together.