There can be no conversion.
rpm is a measure of angular speed whereas miles per hour is a measure of linear speed. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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There is not enough information in the question to answer it. Please restate the question. In general, however, RPM stands for Revolutions per Minute so, for instance, if something revolves 30 times in one minute, then it is rotating at 30 RPM.
There were thirty-three grooves on one side of a standard 78 rpm record The seventy-eight rpm records were released in the early 1800s and were very popular at that time.
sfm = (diameter x RPM )/3.82 MPM = sfm/3.27
The answer depends on what min-1 is measuring, but is likely to be 1 min-1 = 1 rpm.
1500g