To be exact, is an impossible term.
It totally will depend on where your viewing it from as to how fast the bike will have to move, don't forget the earth is spinning at 1,040 mph, the galaxy we are in is spinning at 515,000 and the light your viewing from that bike is bouncing at.. light speed.
Put the bike on a train doing 1000 mph and bike up the aisle
is the bike going 5mph or 1005 ? Depends on where your viewing it from.
Then realise everything down to the smallest parts of an atom are moving at astronomical speeds so really the only reality is.. there is no reality, except for what You make it at any given time. Everything that we experience is not reality in itself, it's our perception of what reality is.
The only thing sure is the more we understand, the less we know.
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