An Explosion Two recording devices are set 2400 feet apart, with the device at point A to the west of the device at point B At a point between the devices 300 feet from point B a small amount of explosive is detonated. The recording devices record the time until the sound reaches each. How far directly north of point B should a second explosion be done so that the measured time difference recorded by the devices is the same as that for the first detonation? | Numerade
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