Current Attempt in Progress

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 $2\mathrm{.}00$ s after the first, and the third echo arrives $1\mathrm{.}78$ 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.