SOLUTION: Mr. Santos can mow his lawn in 4 hours. Mr. Cruz can do the same job in 5 hours. How long will it take them to do the job if they work together?

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Mr. Santos can mow his lawn in 4 hours. Mr. Cruz can do the same job in 5 hours. How long will it take them to do the job if they work together?      Log On


   

Question 1184541: Mr. Santos can mow his lawn in 4 hours. Mr. Cruz can do the same job in 5 hours. How long will it take them to do the job if they work together?
Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
.

    t%2F4 + t%2F5 = 1


Multiply both sides by 20.


    5t + 4t = 20

      9t    = 20

       t    = 20%2F9  hours = 2 2%2F9  hours.    ANSWER

Solved.