Final answer:
Using the 1500 method, if the heart rate is 150 beats per minute, then the time per beat is calculated by dividing 60 seconds by 150, resulting in 0.4 seconds per beat.
Step-by-step explanation:
To estimate the heart rate using the 1500 method, you count the number of small squares on an ECG between two beats and divide 1500 by this number to get the heart rate in beats per minute (bpm).
If a person's heart rate is 150 beats per minute (bpm), we can calculate the time per beat in seconds as follows:
There are 60 seconds in a minute, so if the heart beats 150 times in one minute, then the time for one beat is 60 seconds รท 150 beats = 0.4 seconds per beat.
Therefore, the correct answer from the given options would likely be 150 bpm, assuming this heart rate corresponds to a continuous and regular pattern of beats that can be extrapolated over a minute.