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A more general form that covers both versions could go as follows:
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On a fair, clear day, a man on a hypothetically "flat" earth is standing on flat ground, facing a clear view of two distant objects, also on flat ground, the closest of which is 20 kilometers away from him; there it stands 20 meters tall. In nearly the same direction the man sees a second object at 60 Km away, standing 120 m tall.
- A) Which direction does the man have to walk: toward the objects, further away from them, or not at all -- such that when he lies on the ground to look at them, the two distant objects would appear to be the same height, and
- B) How far must he walk (toward, away or zero) to arrive at this position (where the objects would seem to be equally tall)?
- For extra credit, by what magnitude and in which direction does this (B) distance change if the man had from the start viewed the two distant objects from the prone position, instead of standing?
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The original question, "...which of these should appear taller...?" would be redundant since it is displaced by part (A) in the general form, above. Additionally, anyone attempting to solve the problem who complains, that which object from the start appears taller has nothing to do with which way the man would have to walk in order to see them appear the same height, does not understand the problem at all, or is ignorant of how perspective works. IOW it exhibits nescience typical of flat-earthers.