Simply use the formula v = d/t, where v is the speed, d is the distance traveled and t is time. Plugging it into the formula, we get v = d/t = 0.5/3 ~ 1.67 miles/second.
About 638 mph
If you traveled 100 meters in 30 seconds, then you would be traveling at 3.333... meters per second, or 200 meters per minute, or 12 kilometers per hour (7.45 miles/hour).
You would be going south.
southeast
East
~3 seconds
4,950 feet.
It would take 1 minute 20 seconds.
speed 13 miles, 36 yards and 2 feet per hour
Since one hour is 3600 seconds (60 minutes per hour times 60 seconds per minute), 12 seconds is 12 over 3600th of an hour, or 0.03333 of an hour. In 12 seconds, at 495360 feet per hour, you would travel about 1651 (495360 times 12 divided by 3600) feet.
nothing nothing nothing
After 12 seconds, a car traveling at 87 miles per hour would have traveled approximately 1,520 feet. This can be calculated by first converting 87 miles per hour to feet per second, which is about 128 feet per second. Multiplying this by the number of seconds gives the distance traveled.