How do you do this? (Physics 11)?

C

confused

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1. While John is travelling along a highway, he notices a 160-km marker as he passes through town. Later John passes another marker, 115k.
a) What is the distance between town and John's current location?
b) What is John's current position?

How do you do that and please tell me how you got the answer step by step. Thanks!
 
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