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A hunter is standing on flat ground between two vertical cliffs that are directly opposite one another. He is closer to one cliff than the other. He fires a gun and, after a while, hears three echoes. The second echo arrives $1\mathrm{.}17$ s after the first, and the third echo arrives $0\mathrm{.}684$ s after the second. Assuming that the speed of sound is $343\frac{m}{s}$ and that there are no reflections of sound from the ground, find the distance $($in m $)$ between the cliffs.

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