Hello Can I Get A Step By Step For This Problem 7 Car B Is 30 Miles Directly Eas

Hello can i get a step by step for this

Problem 7.16. Car B is 30 miles directly east of Car A and begins moving west at 90 mph. At the same moment car A begins moving north at 60 mph. What will be the minimum distance between the cars and at what time t does the minimum distance occur ?

Hint: Choose a good coordinate system and minimize the square of the distance. 

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