This math problem is from Pre-Calculus 1st quarter.  Suppose that cities X and Y are exactly 812.5 miles apart. On a certain day, Anne leaves from city X traveling at a rate of 70 mph towards city Y. At the same time, and taking the same route, Bob leaves city Y traveling at a rate of 55 mph towards city X. How far from city Y will Anne and Bob pass each other?  a) Write an equation to help you solve this problem. You may use variables d for distance or t for time.

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