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Mathematics - Algebra - Word Problem on Equations

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Mr. Earl E. Bird leaves his house for work at exactly 8 a.m. every morning. When he averages 40 mph, he arrives at his workplace 3 minutes late, but when he averages 60 mph he arrives at his workplace 3 minutes early. What is the average speed he needs to get to work exactly on time?

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Let the average speed required to get to work on time be x mph, and the distance to the

office be d miles. Then, average time required to reach on ...

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