1. The problem statement, all variables and given/known data A supersonic plane passes directly over an observer at point P, flying due west at an altitude of 11.6 km and a speed of Mach 1.60. What is the plane's horizontal distance from point P when the sonic boom is heard? h = 11.6 km M = 1.6 2. Relevant equations sinθ = Vs/Vo Vo = 548.8 m/s 3. The attempt at a solution When I attempted to solve this problem, I assumed T=20C therefore Vs = 343 m/s. This is because the entire homework set has been using this assumption. Next, I drew a triangle from when the aircraft is directly above the observer's head. I solved for θ and got θ = sin-1(343/548.8) = 38.68 degrees. Next, I brought time to when the cone hits the observer which makes the triangle tanθ = h/x. I solved for x and got 9.29km. When I put this answer in, it was wrong and I only have 1 try left. Am I missing some kind of conversion or concept? Any help or hints are greatly appreciated.