In direct variation, the relationship between two variables \( y \) and \( x \) can be expressed as \( y = kx \), where \( k \) is the constant of variation.
In this case, let \( y \) represent the number of miles the jet travels, and let \( x \) represent the time in hours. Since the jet is flying at a speed of 600 miles per hour, the direct variation equation will be:
\[ y = 600x \]
To find the number of miles the jet travels in three hours, you can substitute \( x = 3 \) into the equation:
\[ y = 600 \cdot 3 \]
Calculating this gives:
\[ y = 1800 \]
Thus, the jet travels 1800 miles in three hours.
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