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A bicyclist and a hiker leave the same place at the same time and travel in the same direction. The bicyclist travels 3 times as fast as the hiker. At the end of 3 hours, they are 24 miles apart. How fast does the hiker travel?
Lupe swims two fewer laps than Mary. If both added seven laps to their daily swims, the sum of their laps would be three times as many as Mary now swims.
Sam and Paul have 480 marbles between them. Sam arranges them in columns with 6 in each column, and Paul arranges them with 9 in each column. The total number of columns is 72. Express the above information in the form of an algebraic expression.
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