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It looks to me like it is saying the following:
60 km/H == 637 rotations/minute
60 MPH == 1026 rotations/minute
Note that 62 MPH == 100 km/H, so the km measurement should be about 0.62 times the M measurement. And 1026/637 = 0.62....
So the math works out just fine, too.
-soD
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