a "n-m per second" is a measure of speed, not of distance. At that speed something can be very, very near if measured for a very short time or it could be millions of light years away if measured for a sufficiently long time. The question, therefore, makes no sense.
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72.5 mph = 32,410,400,000 nanometers per second. To convert from mph to nm per second, multiply mph by 447,040,000.
Approx 31.3 metres per second.
45 miles per hour = 66 feet per second
238,000 miles (rounded)
5 meters.