Question 565530
Cara can shovel the snow from her driveway in 25min.Therease can do the smae job in 30min. How long would it take cara and Teresa to shovel the driveway if they worked toghter?
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The problem has nothing to do with D = RT
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Cara rate = 1/25 job/min
Theresa rate = 1/30 job/min
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Together rate = 1/x job/min
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Equation:
rate + rate = together rate
1/25 + 1/30 = 1/x
(30+25)/(25*30) = 1/x
x = (25*30)/(30+25)
x = 13.64 minutes (time for them to do the job together)
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Cheers,
Stan H.
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