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 hires a gun and, after a while, hears three echoes. The second echo arrives $1\mathrm{.}60$s after the hirst, and the third echo arrives $0\mathrm{.}854$ s after the second. Assuming that the speed of sound is $343$ ms and that there are no reflections of sound from the ground. find the distance $($in m$)$ between the cliffs.