Can someone please help me with this physics problem?

Question

The velocity of a shockwave in water is 1500 meter/second, while the velocity of sound in air is 330 meters/second. The shockwave from a depth charge just beneath the surface of the water is felt by a ship 5.5 seconds before the sound is heard by the crew. How far is the ship from the explosion?
please explain in full details :)
Thank you in advance

Answer 1

d = r * t

The distance to the crew and the ship from the blast is the same.

1500 * t = 330 * (t+5.5)

1170 t = 330 * 5.5

t = 330 * 5.5 / 1170 = 1.55

d = 1500 t = 2,327 m