3600 = 3600(60 + x) gives a person's average speedi -1 The function s(x) = miles per hour if he or she travels one mile in 60 +x seconds. Use a linear approximation to s at 0 to find a person's approximate average speed if he or she travels 60 +x one mile in 53 seconds. What is his or her exact speed? The person's approximate average speed is

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