SOLUTION: [ Joan can type 50 form letters in three hours. When Gill helps, they can do the job in one hour. How long will it have taken Gill to the job alone. Give your answer in minutes. ]

Question 821455: [ Joan can type 50 form letters in three hours. When Gill helps, they can do the job in one hour. How long will it have taken Gill to the job alone. Give your answer in minutes. ]
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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j = 50/3 L/hr
j + g = 50/1 L/hr
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j + g = 50/1
50/3 + g = 50/1
g = 50/1 - 50/3
g = 50*3/3 - 50*1/3
g = 50*2/3
g = 100/3
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j = 1/3 job/hr
j + g = 1/1 job/hr
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j + g = 1/1
1/3 + g = 1/1
g = 1/1 - 1/3
g = 1*3/3 - 1*1/3
g = 1*2/3
g = 2/3 job/hr
---
answer:
1/g = 3/2 1.5 hr/job * 60 min/hr = 90 minutes/job
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