Question

Your friend's heart beats 18 times in 15 seconds when at rest. While running, your friend's heart beats 25 times in 10 seconds. Question 1 a. Find the heart rate in beats per minute at rest and while running. While at rest, the heart rate is beats per minute. While running, the heart rate is beats per minute. Question 2 b. How many more times does your friend's heart beat in 3 minutes while running than while at rest? Your friend's heart beats more times while running.

Answer 1

1a Answer: At rest: 72 beats per minute

While running: 150 beats per minute

Explanation:

Convert beats per second using the conversion of 60 seconds = 1 minute:

`\text{At rest}:\\\\(18\ beats)/(15\ seconds)* (60\ seconds)/(1\ minute)=(18\ beats * 4)/(1\ minute)=72\text{ beats per minute}\\\\\\\text{While running}:\\\\(25\ beats)/(10\ seconds)* (60\ seconds)/(1\ minute)=(25\ beats * 6)/(1\ minute)=150\text{ beats per minute}`

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2b Answer: 234 beats per minute

Explanation:

Subtract "at rest" from "while running" to find the difference in 1 minute. Then multiply by 3 to find the difference in 3 minutes.

3(150 - 72)

= 3(78)

= 234