SOLUTION: amy can mow a field in 90 minutes. Ty can do the same field in 45 minutes. How long will it take to mow the football field if they do it together?

Question 974557: amy can mow a field in 90 minutes. Ty can do the same field in 45 minutes.
How long will it take to mow the football field if they do it together?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
amy can mow a field in 90 minutes. Ty can do the same field in 45 minutes.
How long will it take to mow the football field if they do it together?
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Amy rate 1/90 job/min
Ty rate 1/45 job/min
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Together rate:: 1/x job/min
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Equation:
rate + rate = together rate
1/90 + 1/45 = 1/x
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45x + 90x = 90*45
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135x = 90*45
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3x = 90
x = 30 min (time to do the job together)
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Cheers,
Stan H.
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