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The average age of children in class $7 th$ is $12$ years and $3$ months. Then their average age in seconds is

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386208001 s

386208000 s

3800000 s

3854236 s

answer is B.

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Detailed Solution

The average age of children in seconds is

386208000 s

.
Given that,
The average age of children of class in

7 th

12

years and

3

months.
We know

1 year = 365 days

= 365 \times 24 h

= 365 \times 24 \times 3600 s

12 years = 31536000 s \times 12

= 378432000 s

3 months = 30 \times 3 days

= 30 \times 3 \times 24 h

= 30 \times 3 \times 24 \times 3600 s

= 7776000 s

So, total age in second

= 378432000 + 7776000

= 386208000 s

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