Every Saturday, Ellen visits her friend in the town nearby. At $7 : 30$ a.m., Ellen leaves home and rides a bike to the train station at a speed of $10$ miles per hour. At $8:30$ a.m., Ellen arrives at the train station and gets on a train that travels at a speed of $50$ miles per hour. At $10:30$ a.m., Ellen arrives in the town. How many miles does Ellen travel in total every Saturday?             
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