Basically you can't, as the effort(the watts)needed to reach and maintain a certain speed depends on the riding conditions.
With a bit of a tailwind you might reach and maintain25 MPH/40 KMH easily oneday (=low power).
The next day, maybe there's a headwind instead, and you'll have to struggle like crazy(=high power)only to make 20 MPH/32 KMH.
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You can't convert from Joules to Watts because Joules is a measure of total energy, and Watts measure energy per second.
13,500 kph
The conversion factor is 1.6 kilometers for each 1 mile.
1100 watts = 1.1 kilowatts. Generally, "kilo" is the standard prefix meaning multiply with 1000.
100 kph = 62.1 mph