An Ultrasound equipment installed at a height of 80 m above sea water surface sends out ultrasound that returns from the Sea bed and is detected after 5.4 second. If the speed of ultrasound through sea water is 1500 M per second and that through a year is 320 M per second. Then what is the depth of the sea is that place.
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I don't know what exactly the answer is. In filters I chose primary school but this is higher than that. Sorry.
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