Technical Puzzle #47
Sponsored by MindSumo

Earl E. Bird gets up at 8:00AM to go to work. When he drives at an average speed of 40 mph, he is late by 3 minutes. When he drives at an average speed of 60 mph, he is early by 3 minutes. How many miles per hour does he have to drive to get to work exactly on time?

Enter just the number (ex. 100)