Tom can complete a work in 10 days, Harry can do it in 7 days?

B

Baby Sitter

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Tom can complete a work in 10 days, Harry can do it in 7 days, while Paul can do the work in 12 days. Starting the work together, Tom leaves after 2 days. Harry and Paul continue their work, but Paul leaves one day before Harry and Paul could have completed the work together.

How much work Paul had done before leaving the work?
 
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