I went on a rollercoaster in spain which went from 0 – 135 km/h in 3 seconds and that’s probably the fastest I have ever gone, I think. The fastest I can definitively define, for sure!
Hi! For me it is probably when I travel in planes. The typical cruising airspeed for a long-distance commercial passenger aircraft is approximately 880–926 km/h (547–575 mph).
Mine is the same as Thibaut. When I have to fly between the UK and the USA, on the way home, the planes ride on the jet stream which means you can fly at 570 mph. That’s roughly 0.8 times the speed of sound.
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