Here’s a collection of time-saving math shortcuts, great for back-of-the-envelope estimates. Time and Distance 60 mph = 1 mile per minute Going 60 mph and the exit is in 10 miles? That’s 10 minutes. Been driving a half hour? That’s about 30 miles at highway speeds. Feet Per Second = MPH * 1.5 MPH = Feet Per Second * 2/3 (derivation) 60 mph is about 90 feet per second (88 exactly), so just multiply
