for $4\mathrm{.}7\mathrm{.}2$ Find the distance between the image well and pumping well. Hint: when following steps in $4\mathrm{.}7\mathrm{.}4$ you need to fit straight lines for two legs of data $($choose first leg from starts to minuet $50$ and second leg from minuet $60$ to the end. write answer in $ft$