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Rpm  means number of rotations per minute.

rps means number of rotations per second.

   rpm = 60 * rps
     rps = rpm / 60

In one second, an object rotates 20 times, or, completes 20 rotations (rps).   So in 60 seconds, it will complete 60* 20 = 1200 rotations.  So  rpm value is 1200.

In one minute (60 seconds) if an object makes 2400 rotations (=rpm) , it means that in one second it will rotate 2400/60 = 40 rotations (rps).

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