Question

Two recording devices are set 2200 feet apart, with the device at point A to the west of the device at point B. At a point on a line between the devices, 300 feet from point B, a small amount of explosive is detonated. The recording devices record the time the sound reaches each one. How far directly north of site 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?

Answer 1

if you find out the ratio of the distances of the first explosion from A &B, u get 3:19. (300 mts from B, 1900 mts from A.) So any point from which the distances between A and B will be in the same ratio will give the same time.