In lab you learned to calculate the depth of water based on the time it takes for a sound wave to travel to the ocean floor and back, assuming that sound travels at a speed of 1500 m/s in the ocean. If I conducted the same test above the Mariana Trench, which bottoms out at 10994 m below sea level in the Pacific Ocean, calculate how long it will take for a sound wave my boat emits to return to the surface