The answer will depend on how long you travel for.
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At 87 miles per hour you would be traveling 459,360 feet per hour OR 127.6 feet per second.
102.7 feet every second at 70mph
They are traveling at 4.9 mph
If there is constant acceleration and deceleration then it would be 33.3 ft to stop
One if you are traveling at 57 miles an hour.