Calibration of a speed meter 4-20mA

Dear Friends;

For an analogue I/Os, I always worked with 0-10V which is very easy to understand for me, but now I have been working with a speed meter which spec are 4-20mA = 20-120M/Min. I could not understand that how we can calculate its range as with upper limits 120/20 = 6M/min over1mA but

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