If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two hour long movie.
Question 1 options:
1) 1400
2) 25 000
3) 50 000
4) 170 000
5) This cannot be determined without knowing how many reels were used.

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and I don't see why the height on the film is relevant

24 frame per second X
3600 seconds per hour X
2 hoursX = 172800

which is close to last choice

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