If you are going 30 miles an hour in good condition, it will take how many feet to stop.

158400 feet per hour

Explanation:

First we find:

How many feet are in miles per hour?

Multiply your speed in miles per hour by 5,280. This is the number of feet in a mile. The result is your speed in feet per hour.

For example, 30 miles per hour times 5,280 feet per mile is 158,400 feet per hour.