1. The problem statement, all variables and given/known data 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 0.40s to return. How much additional time will it take the echo in the air to return? 2. Relevant equations v= Δd/Δt 3. The attempt at a solution Δd = vΔt = (1470 m/s) (0.40s) = 588 m The distance for the echo to return is half of this so: 588m /2 = 294 m (I am not so sure about this part) Δt = Δd / v = 294 m / 340 m/s = 0.86 s Additional time: 0.86s - 0.40s = 0.46 s The echo in the air took 0.46s longer to return. Is this right? Any help will be appreciated.