SOLUTION: Charlie can grade exams in 4 hours. It takes John 6 hours to grade the same exams. If
they work together, how long will it take them to grade the exams?
Algebra.Com
Question 622399: Charlie can grade exams in 4 hours. It takes John 6 hours to grade the same exams. If
they work together, how long will it take them to grade the exams?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If A can do a job in 
time periods, then A can do 
of the job in 1 time period. Likewise, if B can do the same job in 
time periods, then B can do 
of the job in 1 time period.
So, working together, they can do
of the job in 1 time period.
Therefore, they can do the whole job in:
time periods. You can do your own arithmetic.
John
My calculator said it, I believe it, that settles it
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