Everything to learn better...




Comparing times

Explainer Video

Tutor: Alice


Comparing times

​​In a nutshell

You can use seconds, minutes and hours to not only give times of events but also to calculate the duration of events. This enables you to calculate their length and you can compare how long different events last, to fit into a daily routine.

Hours, minutes and seconds

Seconds are the smallest unit of time, then minutes and then hours. Use the following equations to convert between them:

1 minute=60 seconds1 \text{ minute} = 60 \text{ seconds}​​

1 hour=60 minutes1 \text{ hour} = 60 \text{ minutes}

Example 1

How many seconds are in 1 hour and 4 minutes1\text{ hour and } 4\text{ minutes}?

1 hour=60 minutes1 \text{ hour} = 60 \text{ minutes}

60+4=64 minutes60 + 4 = 64 \text{ minutes}

64×60=3840 seconds64 \times 60 = \underline{3840 \text{ seconds}}

Comparing times

To obtain the duration of an event, you need to compare the start and ending time of the event.


Count how many full hours are between the start time and ending time.
Count how many full minutes are between the last full hour and the ending time.
Count how many seconds are between the last full minute and the ending time.

Example 2

A concert starts at 18:30:2018:30:20 and ends at 21:10:4521:10:45​. What is its duration?

Number of full hours between  18:30:20\underline{18}:30:20 and 21:10:45\underline{21}: 10: 45 is 22.

Number of full minutes between 18:30:2018:\underline{30}:20 and  21:10:4521:\underline{10}:45 is 4040.

Number of seconds between 18:30:2018:30:\underline{20} and  21:10:4521:10:\underline{45}  is 2525.

Hence the concert has a duration of 2 hours and 40 minutes and 25 seconds\underline{2\text{ hours and } 40 \text{ minutes and } 25 \text{ seconds}}.

Note: There are only two full hours between 18:30:2018:30:20  and 21:10:4521:10:45 as you can see that the number of minutes in the second time is smaller than the first.

Create an account to read the summary


Create an account to complete the exercises

FAQs - Frequently Asked Questions

Is it possible to use an analogue clock to work out duration?

What is duration?

How do you tell if a time is later or earlier than another?


I'm Vulpy, your AI study buddy! Let's study together.