SOLUTION: If a woman can mow a lawn in 2 hrs and her husband in 4 hrs how long will it take to mow the lawn if they work together

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: If a woman can mow a lawn in 2 hrs and her husband in 4 hrs how long will it take to mow the lawn if they work together      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 97737: If a woman can mow a lawn in 2 hrs and her husband in 4 hrs how long will it take to mow the lawn if they work together
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Combined rate = (1 lawn / 2 hrs) + (1 lawn / 4 hrs)
1%2F2+%2B+1%2F4+=+2%2F4+%2B+1%2F4
2%2F4+%2B+1%2F4+=+3%2F4
This says together they can mow 3 lawns in 4 hours
divide top and bottom by 3
%283%2F3%29+%2F+%284%2F3%29+=+1+%2F+%284%2F3%29
So, together, they can mow 1 lawn in 4/3 of an hour or 1 hour 20 minutes