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An echo-sounder in a trawler (fishing boat) receives an echo from a shoal of fish 0.4s after it we sent. If the speed of sound in water is 1500 m/s, h

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An echo-sounder in a trawler (fishing boat) receives an echo from a shoal of fish 0.4s after it we sent. If the speed of sound in water is 1500 m/s, how deep is the shoal?
A. 150m
B. 300m
C. 600m
D. 7500m
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Correct Answer - B
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