If Mark Who? runs 4 X 1 mile on a treadmill at 6 min pace with 60 seconds rest between intervals, an Dave "The Comet" Chomet runs next to him on a similar treadmill at the same distance, pace and rest between intervals, how many fewer BPM will the Comet's heart rate be compared to Mark Who?
A. 10 BPM less
B. 25 BPM less
C. 50 BPM less
D. Could not measure because The Comet fell asleep running that slow
E. Wow!
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