Assume area of rectangular base = A
volume of prism = 5A + 5/2A = 7.5A
Time taken to fill the bottom = 2.5A/7.5A x 6 = 2 mins
Since the question say sketch, the gradient don't have to be
completely accurate (feel free to correct me on this if
it's wrong), hence the graph looks like what you see
there.. as for the cuboid, constant increase, should be no need
explain right
