How many hours is 25 minutes

People often use approximations when calculating the number of days in months. For example, it is common to use the assumption that a month contains four weeks, even though only February in a common year actually does so. If you are converting between months and weeks, the best way to do so is via years, because they always contain 12 months even in a leap year. There are many different ways to write time. The simplest digital form is as written hh. Hours may be either divided into 24 known as the hour clock or two lots of 12 often referred to as the hour clock.

When using the hour clock , the 24 hour cycle starts with the time midnight and runs all the way through to , before rolling over to again. For example , which may be referred to as fourteen hundred hours. This is especially common in military and seafaring situations. When using the hour clock the 24 hour period is divided into two hour periods. Both midnight and midday are Time before midday noon is designated am ante meridiem and time after noon is referred to as pm post meridiem.

For example, pm is the same time as You may need to do calculations of how much time has passed, for example, to work out the end time of an examination, how long you will have to wait for a train, or perhaps to calculate race results. If time is described in words, you will need to convert it into a digital form in order to do any calculations.

It is also simpler to use the 24 hour clock to avoid any confusion, unless all your figures are either am or pm. In the normal way of things, to calculate how much one thing is greater than another you would simply subtract one from another. Instead of the columns being hundreds, tens and units, they are hours, minutes and seconds. If you have a scientific electronic calculator, you will almost certainly have a button that will calculate time.

At the very least, you should be able to use that to convert time to decimals and back again, making calculations much easier. The other way of calculating how much time has passed between Time A and Time B is:. Before you start, convert all the numbers to hour clock for ease. The finish line has a clock, which is exactly synchronised with the start clock, and the finisher records the time on the clock when the racers cross the finish line.

James started at and finished at How convenient, there are no additional seconds! You can simply subtract 28 from 59, and discover that he took 31 minutes exactly. Simon started at and finished at From to is 20 seconds. From to is 35 minutes. From to is 34 seconds. Mary started at exactly, and finished at , or Again, this is quite straightforward.

There are no seconds before the next minute, but there are 45 minutes from to , and 2 seconds from to She therefore took minutes. Sometimes you might need to add up how much time you have spent on a task that you have completed over several days or sessions. On the first day you spend 3 hours and 25 minutes on the task, on the second day you spend 2 hours and 50 minutes and on the third day you finish it off in an hour and a quarter.

You need to add together the three amounts of time , and If you need to remind yourself how to perform an addition calculation, have a look at our page on addition. As there are only 60 minutes in an hour, the next step is to convert 90 minutes into hours and minutes:. The answer is a decimal, so we can convert it back into hours and minutes.

You can use a scientific calculator with a degrees function as described above, or you can do a bit more maths. In decimal form, this is 7. In order to calculate how much you have earned, we multiply the time in decimals by the hourly rate:. The most important thing when calculating with time is to check whether the answer looks about right? If your two numbers are less than an hour apart, is your answer less than an hour?

If they are about 2 hours apart when you look at them, is your answer? If not, you may have lost or gained some time somewhere! Continue to: Measurement Systems Probability.

It is probably one of the most common types of time conversion which is done every day by many people, either in their minds or by using minutes to hours converter like this. This is especially handy if you have large values of minutes to be converted to hours. Below on the webpage, you can find a minutes to hours conversion table.

It can be used at any time as an offline tool, when you need to convert minutes to hours. This measurement unit is considered to be relatively new especially comparing to the ones of hour or second , and it starts its history only in the Middle Ages, when the first water powered more precise time keeping devices were invented instead of common solar or sand clocks. Minute is also a unit used in geometry for measuring angle, as well as for defining latitude and longitude of a point on the surface of earth.

Hour is a common time measurement unit equal to 60 minutes. The unit is used and recognized by SI and has the symbol of h. Though the history of using an hour as a part of solar day is believed to be starting from the epochs of Ancient Egypt, the concept of an hour as we know it now emerged in the early 13 th century, when scientists in Ancient Greece came up with the idea of dividing a solar day exactly into 24 equal parts.

Hour as a time measurement unit is extensively used in science and is applied for defining various related measurement units like kilometers per hour, ampere-hour, kilowatt-hour, etc. One hour is equal to 3. I thought what I have to do would be simple. It isn't. I have 5 columns of repetitive tasks with one starting time. Each task differs in minutes to complete. I need a column of times for completing each of these tasks.

I thought this would be simple, as it is with dates. But I have not found a way to make it work. Is there a way to do this?