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### Course: Measurement & Data - Statistics & Probability 189-200>Unit 3

Lesson 3: Elapsed time

# Time word problem: travel time

Sal solves what time do you leave if you are traveling 39 minutes and need to be home at 6:15. Created by Sal Khan.

## Want to join the conversation?

• Why is this so hard to understand?
• Hey molly!

If something is giving you a hard time, try taking a short break from it and coming back to it a little bit later. Taking some time away from something can help us clear our heads and better approach how to understand it moving forward.

Hope this helps!
• the time unit is killing me /:(
• Perhaps I can help. The reason this unit is difficult is because we are used to thinking in units of 1, 10, 100, but there are 60 minutes in an hour. I like to think about these problems in terms of what is happening each hour.

For example, if you need to get to soccer practice at , and it takes 20 minutes to get there, when should you leave? Well, you have 15 minutes in the "4-hour," so I subtract that from 20 minutes, leaving us with 5 minutes. Now we have to go back to the "3-hour" because we have no more time in the "4-hour." The "3-hour" has 60 minutes, so we get 55 minutes when we subtract the 5 we had left. This means you have to leave at because you still have 55 minutes left in the "3-hour."
• how do you slow down the speed?
• to slow down the speed there should be a gear at the bottem right part of the screen press the gear and then press playback speed and then press ether 0.75 , 0.5 or 0.25 you can also press custom speed and make the speed you want.
• why do i have to do in minutes instead of hours that will be easier
• Because not all hours are exact. There is and then
• Time is a bite easy
• it is Time is a bit easy not a bite
• your dad did not come back because he is still looking for the perfect milk
• isn't a quarter 25 minutes?