SOLUTION: Jack usually mows his lawn in 7 hours. Marilyn can move the same yard in 5 hours. How much time would it take for them to mow the lawn together?
They could mow the lawn in ___ h
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Question 866236: Jack usually mows his lawn in 7 hours. Marilyn can move the same yard in 5 hours. How much time would it take for them to mow the lawn together?
They could mow the lawn in ___ hours if they worked together?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
x = time it takes for Jack to do the job alone
y = time it takes for Marilyn to do the job alone
z = time it takes for them to get the job done when they work together. This is assuming that one person doesn't slow the other down and they work in the most efficient way as a team.
When we make those definitions above, it turns out that we can tie x,y,z together with this equation
In this case,
x = 7
y = 5
z = unknown (leave it as z for now)
Plug those into the equation and solve for z
So it will take hours for them to do the job if they work together. This is assuming that one person doesn't slow the other down and they work in the most efficient way as a team.
Since , this means it takes hours (2 hours, 55 minutes)
If you want the time in minutes only, then multiply it by 60 to get minutes
Note: the time it takes, in hours only, as a decimal is approximately 35/12 = 2.91666666666667 hours
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