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?
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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
