PLEASE EXPLAIN HOW TO DO THE UNIT CONVERSION!!! HOW DO SECONDS SQUARE GET CANCELLED AT THE END ? PLEASE EXPLAIN THAT UNIT CONVERSION PART.

7. Becabe of a break in a buried ail stored tonk, greund water has leaked into the tak to the depht L=2ft. The densities of The water /ft3 Determine The pressure at The oil-woter mateface and at the battom of the tank, each in 16f/in2. (gage). Assume L=17ft. Let g=32.2ft/s2 Given:Yoil=5516/st3Ywater=3atestst6216/stt3gravity(q)=32.2ft/s2g=p0gh(5516/5t3)(32.2)(17)![551b/f3][32.2s2ff][17m