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How many seconds are in a $24{\text{ hour}}$ day?

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Hint: For solving this type of question we should just know about the facts of how many seconds are in a minute. And as we know that in one minute there will be $60{\text{ seconds}}$ . So by using this relation between these two terms we can find out the seconds in a day.

Complete step-by-step answer:
So as we know there are $60{\text{ seconds}}$ in one minute, and mathematically it can be written as
$ \Rightarrow 1{\text{ minute = 60 seconds}}$
And in one hour there will be a total of $60{\text{ minutes}}$ , so mathematically it can be written as
$ \Rightarrow 1{\text{ hour = 60 minute}}$
So, from the above discussion, we knew that in one hour there will be a total of $60{\text{ minutes}}$ and there are $60{\text{ seconds}}$ in one minute.
Therefore,
$ \Rightarrow 1{\text{ hour = 60}} \times {\text{60 seconds}}$
And on solving the above multiplication, we will get the seconds in one hour will be equal to
$ \Rightarrow 1{\text{ hour = 3600seconds}}$
So we have to find seconds for $24{\text{ hour}}$ the day.
For this, we will multiply the hour with the seconds and we get
$ \Rightarrow 24{\text{ hour = 3600}} \times 24{\text{ seconds}}$
And on solving the above multiplication, we will get the seconds in one hour will be equal to
$ \Rightarrow 24{\text{ hour = 86,400 seconds}}$
Hence, there are ${\text{ 86,400 seconds}}$ in a $24{\text{ hour}}$ day.

Note: Time can be characterized as the measurement dependent on which the development of any framework happens. It very well may be estimated as far as seconds, minutes, hours, days, weeks, months, and years. The SI unit of time is seconds. So here also while writing the time we should write the units also and if we don’t write the unit after the conversion then it will be considered as wrong.