SOLUTION: if it takes person A 7 hours to do something, and person b 12 hours to do the same thing, how long would it take in minutes if they worked together?

Question 493040: if it takes person A 7 hours to do something, and person b 12 hours to do the same thing, how long would it take in minutes if they worked together?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of working
In words:
A's rate is
( 1 job ) / ( 7 hours )
B's rate is
( 1 job ) / 12 hours )
Add their rates and make the sum
equal to ( 1 job ) / ( x hours )

Multiply both sides by

hours
minutes
seconds
It will take them 265 minutes and 16 seconds
check answer:

and

OK
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