SOLUTION: If Hector does a job in 12 hours and with the help of Sam they can do it together in 5 hours, how long would it take Destiny to do it alone?

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Question 1100666: If Hector does a job in 12 hours and with the help of Sam they can do it together in 5 hours, how long would it take Destiny to do it alone?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
Hector and Sam equal 5 hours for one job, or, 1/5th of a job per hour. Hector, alone,does 1/12th a job per hour. So Sam equals
1/5-1/12=12-5/60, or 7/60th job per hour
1 /(7/60)=60/7 hours for Sam to do the job alone
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