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.

Linear velocity comparison from radius and angular velocity: Worked example | Khan Academy

Citizenship in early America, 1789-1830s | Citizenship | High school civics | Khan Academy

View All

Charlie Munger’s Final Warning for Investors in 2024

It’s a radically different world from the world we started in. I think it’s going to get tougher. That was Charlie Munger speaking at the Berkshire Hathaway shareholders’ meeting earlier this year. I was there, sitting alongside tens of thousands of peopl…

Understanding SAFEs and Priced Equity Rounds by Kirsty Nathoo

I would like to introduce Kirsty, who is going to talk, uh, in much detail about SAFE’s notes, equity, and the like. “Kirsty.” “All right, good morning everybody. So, my name is Kirsty Nathu. I’m the CFO and one of the partners here at Y Combinator. I h…

Ruchi Sanghvi Speaks at Female Founders Conference 2015

Good afternoon everyone! I’m so excited to be here today. I don’t think I’ve ever spoken to such a large audience of female entrepreneurs and technologists before. This, I think, we need to give ourselves a huge round of applause! Woo! I’m so inspired by …

LearnStorm Growth Mindset: Dr. Michael Merzenich on growing your brain

But we’ve actually trained athletes, you could say, on the sort of academic side of training you would not necessarily imagine. And guess what? It improves our performance on the field. What’s happening for a couple of reasons. One reason is that you’re …

Thought Experiments No One Can Solve

What if I told you that you died last night in your sleep and that your body and mind have been replaced by an exact replica of you, a clone who has all the same characteristics and memories that you had? Impossible, you’d probably reply. But can you prov…

The Mexican-American War | AP US History | Khan Academy

This is a painting of U.S. General Winfield Scott entering Mexico City on September 15, 1847. Scott landed with a U.S. naval fleet several weeks beforehand. He bombarded the coastal stronghold of Veracruz and then fought his way inland toward the capital.…

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

More Articles