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Jay walks at a speed of 3 miles per hour and runs at a speed of 5 miles per hour. He walks for w hours and runs for r hours for a combined total of 14 miles. Which equation represents this situation? 3w +5r = 14
Correct answer: A (parsed from the explanation — this source omits an answer key for this item)
Explanation
Choice A is correct. Since Jay walks at a speed of 3 miles per hour for w hours, Jay walks 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 3 +5 travels can be represented by w r. Since the combined total number of miles 14 3 +5 =14 is , the equation w r 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.
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