SOLUTION: Jack usually mows his lawn in 5 hours. Marilyn can mow the same yard in 4 hours. How much time would it take for them to mow the lawn together? They could mow the lawn in ?

Question 261617: Jack usually mows his lawn in 5 hours. Marilyn can mow the same yard in 4 hours. How much time would it take for them to mow the lawn together?
They could mow the lawn in ? hours if they worker together.
(Simplify your answer. Type an integer, proper fraction, or mixed number.)
Thank you in advance to anyone who can help me with this problem!!!!
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
x/5+x/4=1
9x=20
x=20/9
You get to finish it if you need to reduce it.
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