Lisa and experience shipping clerk can file a certain order in 2 hours. Jim a new clerk needs 3 hours to do the same job. Working together how long will it take them to fill the order?
These types are problems are easy to solve !!!
Lisa does (1/2) the job in one hour and Jim does 1/3 of the job in one hour
1/2 + 1/3 =
[ 2 + 3 ] / 6 =
5/6 of the job in one hour
Take the reciprocal of this = 6/5 hrs to complete the job working together !!!