If 42 beats in 30 s then 84 beats per minute or 84 beats min^-1
Number of minutes in a day is
24 h x 60 minutes h^-1
so number of beats is
24 h x 60 min h^-1 x 84 beats min^-1
total number of beats in 24 hours if the rate is 42 beats in 30 sec.
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