Test: Algebra II

Tom is painting a fence  feet long. He starts at the West end of the fence and paints at a rate of  feet per hour. After  hours, Huck joins Tom and begins painting from the East end of the fence at a rate of  feet per hour. After  hours of the two boys painting at the same time, Tom leaves Huck to finish the job by himself.

1.

If Huck completes painting the entire fence after Tom leaves, how many more hours will Huck work than Tom?

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