SOLUTION: Using his riding lawnmower, John can mow a baseball field in two hours. John’s son, Logan, using a smaller lawnmower, can mow the same field in five hours. How long would it take

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Question 887320: Using his riding lawnmower, John can mow a baseball field in two hours. John’s son, Logan, using a
smaller lawnmower, can mow the same field in five hours. How long would it take them to mow the
baseball field working together?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Using his riding lawnmower, John can mow a baseball field in two hours. John’s son, Logan, using a
smaller lawnmower, can mow the same field in five hours. How long would it take them to mow the
baseball field working together?
***
let x=time it would take them to mow the baseball field working together?
1/2=John's work rate
1/5=son's work rate
1/x=work rate working together
sum of indv. work rates=work rate working together
..
1%2F2%2B1%2F5=1%2Fx
5%2F10%2B2%2F10=1%2Fx
7/10=1/x
x=10/7
How long would it take them to mow the baseball field working together? 10/7 hrs