Using sonar measured the depth of the sea. What was the

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Using sonar measured the depth of the sea. What was the depth of the sea, if the time interval between the occurrence of the sound and his technique was equal to 2.5. Ratio of water 4.6 * 10 ^ -10 m ^ 2 / H, sea water density 1030 kg / m ^ 3.

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Task 40764. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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