In this lesson, the rt=d formula is used to solve a word problem involving uniform motion. The problem involves Andy and Beth running towards each other from opposite ends of an 18-mile road. Andy runs at 7 mph while Beth runs at 5 mph. The lesson walks through setting up a chart and solving for the time it takes for them to meet, which is 1.5 hours. The lesson emphasizes the importance of going back to the original question and answering it correctly.
Solves this word problem using rt=d formula: Andy and Beth are at opposite ends of a 18-mile country road with plans to leave at the same time running toward each other to meet. Andy runs 7 mph while Beth runs 5 mph. How long after they begin will they meet?
Answer: 1.5 hours
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