Question 48849
it takes Reginald 12 minutes to round them up and bring them back. Because Norman doesn't make as much per hour as Reginald, it takes norman 18 minutes to do the same job. How long would it take them working together to complete the round up? 
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Reginald DATA:
time = 12 min/job ; rate=1/12 job/min
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Norman DATA:
time = 18 min/job ; rate = 1/18 job/min
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Working together DATA:
time = x ; rate = 1/x
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EQUATION:
Reg rate + Norman rate = together rate
1/12 + 1/18 = 1/x
30/216=1/x
x= 216/30 = 7.2 minutes (number of minutes for them to do the job together)
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Cheers,
Stan H.