Listening post are at A, B, and C. Point A is 2000ft north of point B, and point C is 2000ft east of B. The sound of a gun reaches A and B simultaneously one second after it reaches C. Show that the coordinates of a gun's position are approximately (860,1000), where the x - axis passes through B and C and the origin is midway between B and C. Assume that sound travels 1100ft/sec