Mr Earl Bird leaves his house for work at exactly 8:00 A.M.every morning. When h

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 isthree minutes late to work. When he averages a speed of 60 milesper hour he reaches three minutes early. At what average speed inmiles per hour should Mr.Bird drie to arrive at his workplaceprecisely on time?