A second wave is sent out by a ship and the reflected wave is detected six seconds later .?

Question

how deep is the ocean floor ?a 1,500 b 3,000 c 4,000 d 6,000 e 9,000

Answer 1

The speed of sound in water is a bit less than 1500 m/s.

In 6 seconds the wave travels 9000 m. It has traveled to the bottom and back up; twice the depth so divide by 2. the depth would be a bit less than 4500 m. The time was given only to 1 significant figure . The depth to 1 significant figure is 4000m.

c 4,000 m.