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Mark and Sandy are participating in a Bike-a-Thon for charity. Mark oversleeps, so Sandy gets a one hour head start and bikes at a speed of 12 miles per hour. To catch up to Sandy, Mark decides that he needs to bike at a speed of 15 miles per hour.

3.An expression that represents Mark's journey is 15(t-1)
What does the coefficient 15 describe
It describes how much mph Mark goes

What does (t-1) represent?
I'm not sure how to explain

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