The journey from home to school takes Adam 20 minutes. One day, on the way to school, he remembered that he had forgotten his pen at home. Adam knew that if he continued to go to school at the same speed, he would arrive there 8 minutes before the bell rang, and if he returned home to get the pen, then, moving at the same speed, he would be 10 minutes late for the start of class. How far along the route did he travel?
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