yego.me
💡 Stop wasting time. Read Youtube instead of watch. Download Chrome Extension

Finding the end time for a movie in 24 hour time | Math | Khan Academy


2m read
·Nov 10, 2024

We are told that Andre goes to a movie that starts at 19 hours 45 minutes, or 1945, and is 90 minutes long. What time is the movie finished? So pause this video and see if you can answer that before we work through it together.

All right, so what I like to do is set up what we could call a timeline. So if this is our timeline, and let's say that this is 19 hours right over here, 19 hours, maybe this is 20 hours right over there, and then this would be 21 hours right over there.

Now what time does the movie start? It starts at 19 hours 45 minutes, so this would be 19 hours 30 minutes, which would be halfway between 19 hours and 20 hours, and 19 hours 45 minutes would be halfway between 1930 and 20. So 19 hours and 45 would be right over there.

So let me write that down. That is 19 hours and 45 minutes, and that is when this movie is going to start. Now it's going to continue for 90 minutes. So when does it end?

So there's a couple of ways you could think about it. The way I think about it is it will take us 15 minutes to get to 20 hours, so that's 15 minutes, and so 15 minutes of the movie has happened by 20 hours.

Then how much is left? Well, 90 minus 15 is 75, so then there's another 75 minutes left. Well, 60 of those 75 are going to get you to the next hour, so then it's going to be like this.

So then you're going to have another 60 minutes to get to the next hour. So so far we've used 75, and then you're going to need another 15 minutes to have a total of 90 minutes.

So then you're going to have another 15 minutes. When does the movie end? Well, as you can see, we started in 1945. 15 minutes got us to 20. Another 60 minutes got us to 21, so now we have a total of 75, and then another 15 would give us a total of 90.

So we are finishing 15 minutes after the 21st hour, or after hour 21, or however you want to think about it. So this time right over here is going to be 21 hours and 15 minutes, or 21:15. So that's the time that the movie is finished.

More Articles

View All
Brain 101 | National Geographic
[Narrator] The brain is the most complex organ in the human body. As part of the nervous system, the brain coordinates all of the body’s functions. In adult humans, the brain is a three-pound gelatinous mass of fat and protein. It’s comprised of four main…
Algorithms are Destroying Society
In 2013, Eric Loomis was pulled over by the police for driving a car that had been used in a shooting—a shooting, mind you, that he wasn’t involved in at all. After getting arrested and taken to court, he pleaded guilty to attempting to flee an officer an…
The ULTIMATE ADVICE For Every 20 Year Old! | Shark Tank's Kevin O'Leary
I wish for all of you a catastrophic failure. Something that makes you cry. That you just want to sit in a dark closet for saying, “Why did I do that? How did that happen?” The idea that you’re going to be successful in all your endeavors is complete BS, …
The Hindu Interpretation of Creation | The Story of God
In the beginning, Hindus believed Ganga flowed in the heavens, but she was held captive by the creator god Brahma. Then Brahma decided to send the river Ganga down to Earth, but there is one problem: Ganga has got such mighty floods, and if she comes on E…
Your Sneakers Are Part of the Plastic Problem | National Geographic
(chill music) [Narrator] You can tell a lot about a person based on their shoes. And today, there’s a ton of options. In 2018, footwear was a $250 billion industry, with over 24 million shoes produced globally. Just look at Kanye. His shoe and apparel lin…
How to Get the Raise You Deserve | Money Disputes With Shark Tank's Kevin O'Leary
Hi there! It’s me again, Mr. Wonderful, coming to you from the tumultuous world of money disputes. The stress, the bitterness, the heartache. I’m here to sweep all that baggage away by helping you find resolution. So let’s do just that. I’ve got a video h…