A swimming pool is 20 ft wide and 40 ft long and its bottom is an inclined

Question:

A swimming pool is 20 ft wide and 40 ft long and its bottom is an inclined plane, the shallow end having a depth of 3 ft and the deep end, 9 ft. If the pool is full of water, find the hydrostatic force on
(a) The shallow end,
(b) The deep end,
(c) One of the sides, and (d) the bottom of the pool.