SOLUTION: It takes one man 10 hours to do a certain job. After he has worked for 4 hours, another man is sent to help him. The two men complete the job in 4 hours. How long would it take
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Question 746589: It takes one man 10 hours to do a certain job. After he has worked for 4 hours, another man is sent to help him. The two men complete the job in 4 hours. How long would it take the second man to do the entire job alone?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of working to get their
rate working together
1st man's rate: ( 1 job ) / ( 10 hrs )
Both men working together: ( 1 job ) / ( 4 hrs )
------------
Let = the time in hours for the 2nd
man to do the job alone
------------
Multiply both sides by
hrs
min
It takes the 2nd man 6 hrs and 40 min to do the job alone
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