It's exactly 50. You can count it like this. (whatever you want to count, for an exaple 80 divided by) 1.6 = 50
mph is speed and kilometer is distance. if you're saying kilometer per hour the answer is 80.47kph.
80 mph = 128.7 kph
80 km/h = 49.71 mph
80/1.6=50 MPH
80 mph = 128.75 kph
8 knots is about 9.2 mph.
No, you'll get rear-ended. That is slightly less than 50 MPH which is not much above the lowest legal speed on a super-highway.
80 mph for 1 hour will displace you 80 miles.
One kilometer per hour is equivalent to approximately 0.621 miles per hour.
65kph = 40.39mph
80 km/h = 49.70969538 mph
1 kilometer is equal to 0.62137119224 mph. 100 kph is equal to around 62 mph.