Answer:
Immediately after she ran the mile, her heart rate was 100 beats per minute.
Explanation:
If Kim ran a mile in Physical Education class, and after one hour of rest her heart rate was 60 beats per minute, having dropped 2/5 of the pace it had immediately after finishing running, to know what was said heart rate it is necessary to perform the following calculation:
2/5 = 0.4
Thus, her heart rate dropped 40%. Since 100-40 is equal to 60, your 60 beats are 60% of the heart rate immediately after running. Therefore, the post-exercise heart rate is derived from the following calculation:
60 = 60
100 = X
((100 x 60) / 60) = X
(6,000 / 60) = X
100 = X
Therefore, her heart rate immediately after running was 100 beats per minute.