SOLUTION: A can do a piece of work in 10 days. After he has worked 2 days, B came to help him and together they finished it in 3 days. In how many days could B alone have done the work? Plea

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In work problems, you add their rates of
working to get their rate working together.
A's rate is ( 1 job ) / ( 10 days ) =
B's rate is ( 1 job ) / ( x days ) =
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The question to ask is: " What part of the job
does A get done in 2 days?"
If he does 1 job in 10 days, he does 1/10
of a job in 1 day. That means he does 2/10
or 1/5 of a job in 2 days.
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So, there is of the job left
to do when B joins him
So, they do 4/5 of the job together in 3 days
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Adding their rates of working:


Multiply both sides by



B alone could have done the work in 6 hours