The Puerto Rican Trench is one of only two trenches in the Atlantic ocean. When sonar is used to detect the depth of the ocean at this trench, and it takes 11.73 seconds for the ship to receive the signal back, how deep is the trench? Assume the speed of sound in water is 1500m/s. (Be sure to include a unit in your answer. (** Use scrap paper and a calculator.) Formulas: depth = , (1500 m/sec xecho travel time) Velocity= distance / time