SOLUTION: If johnny cam mow the the lawn in 10 hours and maria can do it in 8 hours how long will it take tham to do it together.

Algebra ->  Rate-of-work-word-problems -> SOLUTION: If johnny cam mow the the lawn in 10 hours and maria can do it in 8 hours how long will it take tham to do it together.      Log On


   

Question 947400: If johnny cam mow the the lawn in 10 hours and maria can do it in 8 hours how long will it take tham to do it together.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Rate*Time=Output
J%2A10=100
J=10
..
.
.
M%2A8=100
M=100%2F8
M=25%2F2
So then,
%28M%2BJ%29%2At=100
%2810%2B25%2F2%29%2At=100
%2820%2F2%2B25%2F2%29t=100
%2845%2F2%29t=100
t=200%2F45
t=40%2F9 hrs