A freshwater marsh is drained to the ocean through an automatic tide gate that is 4 ft wid...

A freshwater marsh is drained to the ocean through an automatic tide gate that is 4 ft wide and 3 ft high. The gate is held by hinges located along its top edge at Aand bears on a sill at B.If tin' water level in the marsh is h = 6 ft. determine the ocean level dfor which the gate will open. (Specific weight of salt water = 64 lb/ft3.)