Q4/ A sound wave penetrated two layers of the earth's surface and the total time of the wave reflected from the second barrier equals 2 seconds. If you know that the wave's speed in the medium is 200 m/s and in the second medium is 300 m/s, what is the depth of the second medium if the depth of the first is m 100?

Q4/ A sound wave penetrated two layers of the earth's surface and the total time of the wave reflected from the second barrier equals 2 seconds. If you know that the wave's speed in the medium is 200 m/s and in the second medium is 300 m/s, what is the depth of the second medium if the depth of the first is m 100?