Trina and Mariel were paid $60 to paint the garage. Mariel started at 8 AM and Trina did not arrive until 10 AM. The work was completed at 2 PM. What is Mariel's fair share of the earnings?
Describe her fair share if the work was completed at x o'clock pm.
(Source: Adapted from Mathematics Teaching in the Middle School, May 1998)
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