SOLUTION: Show all pertinent solution: A student can do an encoding job for 10 minutes while another student can do the same job in 20 minutes. How long will it take them to finish the job

Question 1039721: Show all pertinent solution:
A student can do an encoding job for 10 minutes while another student can do the same job in 20 minutes. How long will it take them to finish the job if they work together?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
1st student's rate of working:
( 1 job ) / ( 10 min )
2nd student's rate of working:
( 1 job ) / ( 20 min )
Let = time in minutes for them
to do the job working together
---------------------------
Add their rates of working to get their rate
working together

Multiply both sides by

min
Convert min to seconds
sec
-------------------
Working together, they finish the job
in 6 min 40 sec

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