The distance that a person can see to the horizon on a clear day from a point above the surface of Earth varies directly as the square root of the height at that point. If a person 196m above the surface of Earth can see 21km to the horizon, how far can a person see to the horizon from a point 36m above the surface?

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d = k√h, so d/√h is constant
You want d such that
d/√36 = 21/√196

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oobleck · Answer

d = k√h, so d/√h is constant You want d such that d/√36 = 21/√196