Question 551399
20 miles per hour times 5280 equals 105600 feet per hour divided by 60 equals 1760 feet per minute divided by 60 equals 29.3333333333 feet per second.
30 miles per hour times 5280 equals 158400 feet per hour divided by 60 equals 2640 feet per minute divided by 60 equals 44 feet per second.
.3 of a mile is equal to .3 * 5280 = 1584 feet.
at 20 miles per hour you are traveling 29.3333333333 feet per second.
divide 1584 feet by 29.3333333333 feet and you get 54 seconds.
at 30 miles per hour you are traveling 44 feet per second.
divide 1584 feet by 44 and you get 36 seconds.
it takes about 18 seconds more to go through the school zone at 20 miles per hour than it takes to go through the school zone at 30 miles per hour.