34.286 seconds.
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1 mile = 1760 yards , 1 yard = 3 feet , 1 hour = 60 mins 60 miles per hour = 60 * 1760 * 3 / 60 feet per min therefore, after cancelling, 60 mph = 1760 * 3 ft / min = 5280 ft / min .
75 miles per hour = 110 feet per second
Divide the 90 miles by 3600. That's the amount of miles you travel in a second. Then convert this from miles to feet.
45 miles per hour = 66 feet per second
12 mph = 12 * 1760 * 3 / 3600 = 17.6 feet per second