The distance d, in miles, that a car travels on a 6-hour trip is proportional to its speed s (which we assume remains the same throughout the trip), in miles per hour. What is the constant of proportionality in this case? Exercise (a) The distance d, in miles, that a car travels on a 6-hour trip is proportional to its speed s (which we assume remains the same throughout the trip), in miles per hour. What is the constant of proportionality in this case? Step 1 Since distance traveled is speed times time, the constant of proportionality is the time we traveled, namely 6 Correct: Your answer is correct. seenKey 6 hours. Exercise (b) The distance d, in miles, that a car travels on a 6-hour trip is proportional to its speed s (which we assume remains the same throughout the trip), in miles per hour. Write a formula that expresses d as a function of s. Step 1 The distance traveled is the speed times time driven. Distance = Speed Time The time is hours. We use s for speed and d for distance. With these values we express the above formula as d =