Mach 3.5 is about 2,595.4 mph
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35 mph = 51.33 feet per second.
Time = Distance/Speed
At 35 mph you will travel about 154 feet in three seconds.
If you drove 35 mph for 2 hours, you would drive 70 miles. 35 X 2 = 70.
mph means Miles Per Hour, so 21 miles takes 21/60=.35 hour. Then .35 hour is equal to .35*60=21 minutes. So the final answer is 21 minutes