If a human heart beats once in every 0.8 s, find the number of times it has beaten in the life of a 10 year old boy

Explanation

To solve the problem of finding how many times a human heart beats in the life of a 10-year-old boy, we can follow these steps:

### Step 1: Calculate the total number of seconds in 10 years.
1. There are 365.25 days in a year (accounting for leap years).
2. Each day has 24 hours, each hour has 60 minutes, and each minute has 60 seconds.
3. Therefore, the total number of seconds in one year is:
\[
\text{Seconds in one year} = 365.25 \, \text{days/year} \times 24 \, \text{hours/day} \times 60 \, \text{minutes/hour} \times 60 \, \text{seconds/minute}
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