time and speed can not be converted between one another.
13.5 mph
11.1014 mph
To travel 500 feet at 40 mph, it would take about 6 seconds. This is calculated by converting 40 mph to feet per second (40 mph = 58.67 fps) and dividing 500 feet by the speed in feet per second.
To convert a time in seconds to miles per hour, you first need to convert the distance to miles. 40 yards is approximately 0.02273 miles. Then, you can calculate the speed by dividing the distance by the time in hours. For 4.3 seconds over 40 yards, the speed is approximately 1.25 mph.
80.25 yards
55.92 seconds.
13.64 seconds.
410.3 feet.
1.5 minutes or 90 seconds. which is 1/40 of an hour. mph means exactly what it stands for "miles per hour" so you take 1/40 which gets you to 90 seconds.
At 40 mph you are traveling about 60 feet per second, so it would take about 6 seconds to go 360 feet.
18/40 = 0.45hour = 1,620seconds
About 40 seconds.