A Boat Sounds a Fog Horn on a Day When

Multiple Choice

A boat sounds a fog horn on a day when both the sea water and the air temperature are 25.0° C. The speed of sound in sea water is 1 533 m/s. How much earlier (in s) does a dolphin 1 000 m from the source hear the sound than a person in a boat that is also 1 000 m distant? (Ignore the time it takes the sound to reach the water surface.)

A) 0.652
B) 2.12
C) 2.24
D) 2.77
E) 2.90