There are 5280 feet in a mile and there are 3600 seconds in one hour, so there are 5280 feet divided by 3600 seconds feet per second in one mile per hour. Calcualte the number of feet per second in one mile per hour. Multiply by 40 to convert 40 miles per hour to feet per second. Multiply that by 15.
John
My calculator said it, I believe it, that settles it
