How many minutes are there in $8$ hours?

If there are $60$ minutes in an hour, we must multiply the number of hours by $60$ to obtain the equivalent number of minutes.

$8\cdot60=480$

That is, $8$ hours equals$480$ minutes.

**How many minutes are** **$90$**** seconds?**

In one minute there are $60$ seconds, so we must divide the number of seconds by $60$ to get the number of minutes.

Attention! Unlike the previous exercise, here we must divide by $60$ instead of multiplying.

The data we were given is the number of seconds and we have to find out the minutes.

$1$ minute $=~60$ seconds

$X$ minutes $=~90$ seconds

$x=\frac{90}{60}=\frac{9}{6}=\frac{3}{2}=1.5$

That is, $90$ seconds equals $1.5$ minutes.

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**What are the units of time?**

In the case of time, the most common units are measured with a clock and these are seconds (unit in the International System), minutes and hours, although we can also measure it in days, weeks, months, years, centuries, etc.

**How do you calculate the seconds in a day?**

We know that in a day there are $24$ hours, in an hour there are $60$ minutes and in each minute there are $60$ seconds, so in order to calculate how many seconds there are in a day we would only have to do a multiplication.

First let's see how many seconds there are in an hour. To multiply

$1$ hour

$60\times60=3600$

In an hour there are $3600$ seconds, so now let's multiply by $24$ hours in a day.

$1$ day

$3600\times24=86400$

Therefore in a day there are $86400$ seconds.

**How to convert time units?**

In order to see how to do time conversions let's look at the following examples, where we will need some time equivalences.

**Example 1**

**Task.** Convert $6$ minutes to seconds

Solution

We already know that one minute has $60$ seconds, so let's do a multiplication

$6\times60=360$

**Result**

$6$ minutes is equal to $360$ seconds.

**Example 2**

**Task.** Convert $120$ hours to days.

Solution

A day has $24$ hours so in this case a division will be made.

$\frac{120}{24}=5$

**Result**

$120$ days equals $5$ days