SOLUTION: A farmer can plow a field in 40 minutes. His son can plow the same field in 1 hour. How long would it take them to plow the field if they worked together? Formula: (Together/a

Question 1036630: A farmer can plow a field in 40 minutes. His son can plow the same field in 1 hour.
How long would it take them to plow the field if they worked together?
Formula: (Together/alone)+(Together/alone)= 1 job done
*What I had so far, don't know if it's correct:
t=together
1 hour=60 minutes
(t/40 min.)+(t/60 min.)= 1 job done
Found 2 solutions by ikleyn, jorel555:
Answer by ikleyn(52778)   (Show Source): You can put this solution on YOUR website!
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A farmer can plow a field in 40 minutes. His son can plow the same field in 1 hour.
How long would it take them to plow the field if they worked together?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The rate of the farmer is of the field per minute. The rate of the son is of the field per minute. When working together, their rate is the sum = = = . Hence, it takes 24 minutes for them to plow the field if they work together.

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    - Solving more complicated word problems on joint work,
    - Selected joint-work word problems from the archive
in this site.

Read them and get trained in solving joint-work problems.

Answer by jorel555(1290)   (Show Source): You can put this solution on YOUR website!
t/40+t/60=1;
3t+2t=120
5t=120
t=120/5=24 minutes working together!!!!!!!!!
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