You can put this solution on YOUR website! if i can do a job for 4hrs and we can do the same job in 2hrs,
how long can you do the job alone?
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It's obvious that you can do half the job in 2 hrs, therefore the other guy can do the job alone in 4 hrs also
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Anyway, here is the shared work equation
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Let y = time for you to do it alone
Let the completed job = 1
: + = 1