SOLUTION: Lyman can mow the family yard in 75 mins, while Jean can mow it in 60 mins. If they worked together, how long will be needed for the job?

Question 331743: Lyman can mow the family yard in 75 mins, while Jean can mow it in 60 mins. If they worked together, how long will be needed for the job?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Lyman can mow the family yard in 75 mins,
Jean can mow it in 60 mins.
..
lyman can do 1/75 of job in 1 minute
jean can do 1/60 of job in 1 minute
..
together
1/75+1/60 = 4+5 /300
9/300 of the job in 1 minute.
so together they will do in 300/9 minutes
..
33.33 minutes
..
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