May rides her bike the same distance that leah walks. may rides her bike 10 km/h faster than leah walks. if it takes may 1 hour and leah 3 hours to travel that distance, how fast does each travel

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?