Stickels Puzzle #47
I can mow my lawn in 2 hours. My son can mow the same lawn in 2.5 hours. If we both work together, how long will it take us to mow the lawn?

1/3 hour
4/9 hour
5/9 hour
2/3 hour
7/9 hour
8/9 hour
1 hour
10/9 hours
11/9 hours
None of the above are correct

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