Mr Earl Bird leaves his house for work at exactly ...

Mr Earl Bird leaves his house for work at exactly 8:00 A.M. every morning. When he averages a speed of 40 miles per hour, he is three minutes late to work. When he averages a speed of 60 miles per hour, he reaches three minutes early. At what average speed, in miles per hour, should Mr.Bird drie to arrive at his workplace precisely on time?


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