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16 + 16 + 18 + 18 = 68
400 ft
i think it was either 16 or 18 but it should be 16 A reasonably good rested heart rate is 72 beats per minute. So 12 beats in 10 seconds is more normal than 16 to 18.
It is: 18/16 = 112.5%
16/18=.8888888888=88.88%