+130511
Very nice, Alan.....I like the way you set up the equation in terms of h and t
Here's a graph of the function that relates h and t.......https://www.desmos.com/calculator/1t8vmw70lp
Notice that when t = 7.013, h= 6.....and when t = 12.623, h =0......both confirm Alan's calculations
Also.....I have plotted the tangent line to the curve when t = 7.013.......this tangent line will have a slope of -77/144 ≈ -.5347.....indicating, as Alan has said, that the water level is falling at about .535 in/min when h = 6
