Mr. Earl E Bird leaves his house for work at exactly 8:00 am every morning. When he averages 40 miles per hour, he arrives the work place three minutes late. When he averages 60 miles per hour, he arrives three minutes early. a)Suppose his house is x miles from work. Find in terms of x, how long in minutes it takes Earl to get to work when he drives 40 miles per hour. What If he drives 60 miles per hour how long in minutes it will take?
b) At what average speed in miles per hour, should Mr. Bird Drive to arrive at his workplace precisely on time?