A person travels d miles at a constant speed s (in miles per hour) for t hours.
a. Complete Table 20 to help find a formula that describes the association among s, t, and d. Show the arithmetic to help you see a pattern.

b. Solve the formula you found in part (a) for t.
c. Use the formula you found in part (b) to find the value of t when d = 315 and s = 70. What does your result mean in this situation?
d. A student plans to drive from Albuquerque Technical Vocational Institute in Albuquerque, New Mexico, to Denver, Colorado. The speed limit is 75 mph in New Mexico and 65 mph in Colorado. The trip involves 229.9 miles of travel in New Mexico followed by 219.2 miles in Colorado. If the student drives at the posted speed limits, estimate the driving time.

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Table 20 Speed, Time, and Distance Speed Time Distance miles per hour) hours (miles) 50 70 65