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The Question: A boat is floating at rest in dense fog near a large cliff. The captain sounds a horn at water level and the sound travels through the salt water (1470 m/s) and the air (340 m/s) simultaneously. The echo in the water takes 0.40 s to return. How much additional time will it take the echo in the air to return.
Relevant equations: v = distance/time
Please do not copy/paste answers from other sites such as yahoo or physics forum as I have already checked them before I came here.
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