SOLUTION: Sidney can mow the law in 4 hours using her riding mower. Her son can mow the same lawn in 12 hours using a push mower. How long would it take to mow the lawn working together?

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Question 806929: Sidney can mow the law in 4 hours using her riding mower. Her son can mow the same lawn in 12 hours using a push mower. How long would it take to mow the lawn working together?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x/4+x/12=1
3x/12+x/12=1
4x/12=1
x/3=1
x=3