Assuming a constant speed of 75 mph, it would take approximately 6,000 years to reach Neptune, which is about 2.7 billion miles away from Earth. This calculation is based on the average distance between Earth and Neptune, the speed of light, and the speed of the vehicle. However, it's important to note that this theoretical calculation does not account for factors such as fuel limitations, the need for rest stops, or the current technology available for space travel.
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Of course, there is no road to "drive" from here to Neptune. Assuming there were, just divide the distance by the speed.
It would take 1 hour.
7 hours
90 minutes.
That would depend greatly on whether one is flying, driving, or walking.
It takes one hour to drive 80 miles at 80mph.