Another Brain Teaser
You drive from Point A to B at 60mph and then stop at a diner in B for 30 minutes. You then drive from B to C at a speed of 30mph. When you reach C, your watch tells you that you left point A four hours ago. Looking over the map, you realize that the distance from B to C is 1/4 of the distance from A to B. How many minutes did it take you to drive from point B to C?