Two friends just had lunch together in downtown. After they say goodbye, one bikes home south on Wilson street at 10 mph

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Two friends just had lunch together in downtown. After theysay goodbye, one bikes home south on Wilson street at 10mph and the other starts driving down main to the West at 15mph. The one driving gets stopped at a traffic light for a minute,then gets going again. So, two minutes later the biker has made it.33 miles and the driver has gone .25 miles. At this moment,how fast is the distance between them changing? Find the rate ofchange.