SOLUTION: TV1 and TV2 are television channels both showing films that Start at 8:30 PM. TV1 puts on advertisemeants every 10 minutes after the start of a film. TV2 to puts on Advertisements

Question 1116914: TV1 and TV2 are television channels both showing films that Start at 8:30 PM. TV1 puts on advertisemeants every 10 minutes after the start of a film. TV2 to puts on Advertisements every 15 minutes after the start of a film.
If the shortest film ends after two hours, how many times (during the films) will advertisements appear on both channels at the same time?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
Look at multiples of 10's and 15's.
Every 30 minutes, both channels show advertisements at the same time. Starting from 8:30PM, and going to 10:00PM, how many of these happen?

You may no longer need to make a table or chart for this.
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