Question

5 Travis was walking to school when hesaw some friends walking a block aheadof him. After running to catch up with hisfriends, his heart was beating 24 beatsevery 10 seconds. At this rate, how manytimes would his heart beat in 3 minutes?timesoShow your work.

Answer 1

His heart was beating 24 beats every 10 seconds.

We have to calculate how many times would his heart beat in 3 minutes.

Knowing that one minute is 60 seconds, we can start by calculating how many seconds are represented in 3 minutes:

`3\min \cdot(60s)/(1\min)=3\cdot60s=180s`

Three minutes are equal to 180 seconds. Then, we can apply the rule of three: if 10 seconds correspond to 24 heart beats, we can calculate the number of heart beats in 180 seconds as

`\begin{gathered} 10s\longrightarrow24\text{ beats} \\ 180s\longrightarrow x=180\cdot(24)/(10)=180\cdot2.4=432\text{ beats} \end{gathered}`

Answer: In three minutes, his heart will beat 432 times.