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In order to calculate a distance, we must use the equation

Speed=Distance/Time

and rearrange it by multiplying both sides by time to get

Distance=Speed*Time.

If the station is measuring time for a return signal, the signal only spent half its total time traveling to the object, or in this case, 1.5 seconds. Sonar stations receive signals sent via sound-waves, but since the speed of sound varies in different mediums, the speed, and thus the distance, depends on where the sonar station is. If the station is above ground, the speed of sound is approximately 343 meters/second, so the object would have to be 514.5 meters away. If however the station and object were underwater, the speed of sound is about 1497 meters/second (varying depending on water temperature and composition) meaning the object would be 2245.5 meters away.

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Q: A sonar station picks up a return signal after 3seconds How far away is object?
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