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.w hat is your friend's heart rate in beats per minute at rest and while running? how many more times does your friend's heart beat in 3 minutes while running than while at rest?
1 answer:
<u>Answer</u>
Part 1: 72 times/minute
Part 2: 150 times/minute
Part 3: 234 times
<u>Explanation</u>
<u><em>Part 1</em></u>
18 times in 15 seconds when at rest.
In 1 second = 18/15
= 1.2 times/second
In 1 minute = 1.2×60
= 72 times/minute
<em><u>Part 2</u></em>
25 times in 10 seconds while running.
In 1 second = 25/10
= 2.5 times/second
In 1 minute = 2.5×60
= 150 times/minute
<em><u>Part 3</u></em>
In 3 minutes while at rest = 72×3 = 216
In 3 minutes while running = 150 × 3 = 450
How many more times does your friend's heart beat in 3 minutes while running than while at rest?
Answer = 450 - 216
= 234 times
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