Maths-
SAT
Easy
Question
The graph shows the average heart rate for 15 people before, during, and after a period of strenuous exercise. The horizontal axis shows time, in minutes, and the vertical axis shows average heart rate, in beats per minute. The exercise period began at 5 minutes and ended at 15 minutes.
Approximately how many minutes did it take after the exercise period ended for the average heart rate to first return to the average heart rate before the exercise period began?
- 9
- 15
- 24
- 27
The correct answer is: 9
At the end of 15 minutes the heart rate is 150 beats per minute
The heart rate was normal after 24 minutes
The time taken to get back to normal is
24 – 15 = 9 minutes
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