A pulse of sound is produced at the bottom of a boat. The sound travels through the water and is reflected from a shoal of fish. The sound reaches the boat again 1.2 s after it is produced. The speed of sound in the water is 1500 m/s.
How far below the bottom of the boat is the shoal of fish?
1 )
450 m
900 m
3 )
1800 m
4 )
3600 m
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