To convert miles per hour to feet per second, multiply by 5280 and divide by 3600. Therefore, 5 miles per hour is equal to (5 x 5280)/3600 = 7.3 recurring (that is, 7.3333...) feet per second.
Dividing 300 feet by 7.3333... feet per second gives 40.90 recurring (that is, 40.909090...) seconds.
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Five hours.
60 mph is 88 feet per second. 40 ft / 88 ft/s = ~.45 seconds
3 3/4 hrs.
Definitely, with no problem. If dropped from an altitude of at least 3,006-ft, the car's speed will be at least 300 mph when it hits the ground. The fastest production vehicle you can buy is the Bugatti Veron Super Sport. It has a top speed of 267 mph. Top Fuel Dragsters regulating go over 330 mph in 1/4 mile from a standing start. The Trust SSC hit 771 mph in 1997. Many cars have bested the 300 mph mark.
It will take 20 min to go 20 miles at 60 mph.