SOLUTION: Melissa can do 2 jobs in 3 hours; when Krista helps, together they manage to do 8 jobs in 3 hours. How long would it take Krista to do 1 job?
I have not done a problem like t
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-> SOLUTION: Melissa can do 2 jobs in 3 hours; when Krista helps, together they manage to do 8 jobs in 3 hours. How long would it take Krista to do 1 job?
I have not done a problem like t
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Question 1067976: Melissa can do 2 jobs in 3 hours; when Krista helps, together they manage to do 8 jobs in 3 hours. How long would it take Krista to do 1 job?
I have not done a problem like this in a while, and I cannot locate past notes on how to solve it. Any sort of assistance would be awesome, thank you! Found 3 solutions by josmiceli, rothauserc, ikleyn:Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Add their individual rates of working to
get their rate working together
Let = Krista's time in hrs to do 1 job
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Melissa's rate of working:
[ 2 jobs ] / [ 3 hrs ] = jobs/hr
Krista's rate of working:
[ 1 job ] / [ t hrs ]
Their rate working together:
[ 8 jobs / 3 hrs ]
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Add their rates of working:
Multiply both sides by
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Krista takes 1/2 hr to do 1 job
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check answer:
OK
You can put this solution on YOUR website! (2/3) + x = (8/3)
:
x = (8/3) - (2/3) = 2
:
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krista does 2 jobs in 1 hour
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