When will the movies begin again at the same time?

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deecarney4

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A movie theater runs two documentary films continuously. One documentary runs for 40 minutes and a second documentary runs for 60 minutes. Both movies begin at 3:00 p.m. When will the movies begin again at the same time?

Just an example of a word sentence???

10:00 Pm
 
deecarney4 said:
A movie theater runs two documentary films continuously. One documentary runs for 40 minutes and a second documentary runs for 60 minutes. Both movies begin at 3:00 p.m. When will the movies begin again at the same time?

Just an example of a word sentence???

10:00 Pm
Click to expand...

So, what did you try? I'd do this.....

first movie: 3:00, 3:40, 4:20, 5:00, 5:40, 6:20, 7:00, 7:40, 8:20, 9:00, 9:40, .....
second movie: 3:00, 4:00, 5:00, 6:00, 7:00, 8:00, 9:00, 10:00, 11:00, .....

What is the first time after 3 p.m. that the two movies start together?
 
The LCM of 40 and 60 is 120. 120 minutes = 2 hours. Therefore, they will start at the same time again at 5 pm
 
You're certainly correct, Galactus. Since this was posted in the Pre-Algebra forum, I chose to take a basic approach.
 
Mrspi said:
Since this was posted in the Pre-Algebra forum, I chose to take a basic approach.
Click to expand...
LCMs (and GCFs) are usually covered in elementary and middle school, even before pre-algebra, so it should be "safe" to use that concept, I would think. :wink:

I could be wrong, of course.... :D

Eliz.
 
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