To find Porter’s heart rate while running, we need to calculate the number of beats per minute (bpm).
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Running:
- He has 42 beats in 1/4 minute.
- To find the heart rate in beats per minute, we can scale it up to a full minute. Since there are 4 quarters in a minute, we multiply the number of beats by 4:
\[ \text{Heart rate (bpm)} = 42 \text{ beats} \times 4 = 168 \text{ bpm} \]
Thus, Porter's heart rate when he runs is 168 beats per minute.