Two runners, Alice and Bob, are training for a marathon. Alice runs at a speed of 8 miles per hour, while Bob runs at 6 miles per hour. They start from the same point but run in opposite directions. After 1 hour, Alice turns around and runs back towards Bob at the same speed, while Bob continues running in his initial direction. How far apart are they after 2 hours? Let's think step by step and output the final answer within \boxed{}.
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