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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?
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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.
You can find many other similar solved joint-work problems in the lessons
- Using Fractions to solve word problems on joint work,
- 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.