The Rule of Three is a simple mathematical method for calculating direct or inverse proportionality of a quantity depending on another quantity according to the formula , where is a constant. Simply put, quantities are in direct proportion. Their ratio is equal to a constant. If the quantity doubles or triples, the other quantity will also double or triple as a result.

You have internet speed of 2 MB per second and downloaded a file in 450 seconds. How long would it take to download the same file if the internet speed was 6 MB per second?

2 MB .... 450 seconds

6 MB .... x seconds

Thus:

450 * (2 / 6) = x

450 * 0.33333 = x

150 = x

You would download the file in 150 seconds.

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