Marina Exam Reviewer: If a sound signal is emitted from the oscillator of a fathometer, and two seconds elapse before the returning signal is picked up, what depth of water is indicated?

Marina Exam Reviewer:

If a sound signal is emitted from the oscillator of a fathometer, and two seconds elapse before the returning signal is picked up, what depth of water is indicated? 

A. 1248 fathoms 
B. 1048 fathoms 
C. 824 fathoms 
D. 1648 fathoms 

Answer:     C. 824 fathoms 

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