<human>:  Jerry can run from his house to his school and back in the time it takes his brother Carson to run to the school. If it takes Jerry 15 minutes to make a one-way trip from his house to his school and the school is 4 miles away, how fast does Carson run in miles per hour?
<bot>: How long does it take Carson to get to the school? ** We know that Carson takes twice as long as Jerry to get to the school, so we can find the time it takes him by multiplying Jerry's time by 2: 15 minutes * 2 = <<15*2=30>>30 minutes
How long does it take Carson to get to the school? ** Then convert that time to house by dividing by 60 minutes/hour = 30 minutes / 60 minutes/hour = <<30/60=.5>>.5 hour
How fast does Carson run? ** Then divide the distance Carson runs by the time it takes him to run it to find his speed: 4 miles / 0.5 hours = <<4/0.5=8>>8 miles/hour
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