Tanner's chemistry textbook weighs 5/6 of a pound and his geometry textbook weighs 1/6 of a pound. How much more does the chemistry textbook weigh than the geometry textbook?

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Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes. she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?