Two friends meet at the Davis water tower. They start biking away from each other at the
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Question:
- Two friends meet at the Davis water tower. They start biking away from each other at the exact same time: friend A bikes west at a constant speed of 9 miles per hour, and friend B bikes south at a constant speed of 12 miles per hour.
- (1) Draw a picture showing the starting point and the positions of the two bikers after t hours.
- (2) At what rate is the distance between the two bikers changing when they've been biking for precisely one hour?
- (3) At what rate is the distance between the two bikers changing when they've been biking for precisely 20 minutes.
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