Length of a trip in 24 hour time | Math | Khan Academy

2m read

·Nov 10, 2024

Hello! So we're told Colette rides her bike home from school every afternoon. She leaves school at 14:55 and arrives home at 15:25. How long does she ride her bike? So pause this video like always and see if you can answer that question: how long is her bike ride home?

All right, now to help us answer that question, I'm going to set up a timeline. So that's my timeline there, and let's say that everything is going on between 14 hours and it looks like between, actually, past 15 hours. So I'll go to 16 hours. So that is hours, and this is 15 hours, and then 16 hours would be maybe right over there 16 hours.

And this would be 14 and a half, just to make things a little bit clearer. This would be 15 and a half, just like that. Actually, it'd be a little bit— it would be something like that. And so let's see, she leaves school at 14:55. Where is that on this timeline? Well, 14:55 is 5 minutes before 15.

So it's going to be roughly right over here, so that is when Colette leaves. So that is 14:55, and then when she arrives, 15:25, that's 25 minutes after 15 hours, so that is right over there. So this right over there is when she arrives home, 15:25.

And so how long is that? Well, the way I think about it is if we go from 14:55 to 15:00, that is 5 minutes. So this part right over there is five, and then to go from 15:00 to 15:25, that's another 25 minutes.

So the total length of her trip in time is going to be 5 minutes plus 25 minutes. 5 plus 25 is 30. 30 minutes, and we are done.

Functions continuous on all real numbers | Limits and continuity | AP Calculus AB | Khan Academy

The Fifth Amendment - takings clause | US government and civics | Khan Academy

View All

Normative and positive statements | Basic economics concepts | AP Macroeconomics | Khan Academy

What we’re going to do in this video is discuss the difference between normative statements and positive statements, and you’ll see these words used usually in an economic context, sometimes a philosophical one. A normative statement is one that really i…

Coal Mining's Environmental Impact | From The Ashes

[explosion] MARY ANNE HITT: To me, as somebody who had grown up in the mountains and loved the mountains, the idea that a coal company had the right to blow up an entire mountain and wipe it off the map forever was just unconscionable. These places are n…

Warren Buffett's Financial Advice to Students

Testing 1 million, 2 million, 3 million that’s working okay. I’d like to, uh, talk to you about your financial future and I hope those figures become applicable to all of you as we go along. At, uh, uh, and I’d like to start, uh, by posing a problem for …

Worked example: Calculating the mass of a substance in a mixture | AP Chemistry | Khan Academy

We’re told that a 0.450 gram potassium supplement contains 22 percent potassium by mass. The potassium is present in the supplement as potassium chloride, which has a molar mass of 74.55 grams per mole. How many grams of potassium chloride are in the pota…

The aftermath... Tenants Stopped Paying Rent

What’s big, eyes? It’s Graham here. So last month, I addressed a highly publicized article which found that nearly 1⁄3 of Americans were unable to pay their rent for the month of April. At the time, that was a very alarming statistic. For someone who has…

Khan for Educators: Basic site navigation

Hi, I’m Megan from Khan Academy, and in this video, we’ll browse through Khan Academy together. We’ll start by logging into the platform and then go through some of the key navigation features together. To get started, go to khanacademy.org and click “Te…

Length of a trip in 24 hour time | Math | Khan Academy

More Articles