1. The problem statement, all variables and given/known data A supersonic aircraft is flying parallel to the ground. When the aircraft is directly over- head, an observer sees a rocket fired from the aircraft. 9.28 s later the observer hears the sonic boom, followed 3.61 s later by the sound of the rocket engine. What is the Mach number of the aircraft? 2. Relevant equations Vplane = Machplanevsound And that's all I really know... 3. The attempt at a solution I'm standed on this one. The homework was covering soundwaves but he didn't talk about sonic waves for more than 3 minutes in class, and the textbook is really really non-descriptive. Any jumpstarts you guys can give me would be great, but I don't see how you're supposed to get anywhere with just two time variables. Thanks alot for the patience!