OG详解-OG9 数学1 Q8

Choice A is correct. Since Jaywalks at a speed of 3 miles per hour for w hours, Jaywalks a total of 3w miles. Since Jay runs at a speed of 5 miles per hour for r hours, Jay runs a total of 5r miles. Therefore, the total number of miles Jay travels can be represented by 3w+5r. Since the combined total number of miles is 14, the equation 3w+5r = 14 represents this situation.
Choice B is incorrect and may result from conceptual errors. Choice C is incorrect and may result from conceptual errors. Choice D is incorrect and may result from conceptual errors.