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A plane passes from 900 meters over my head. I hear the shockwave after 2.2 seconds. At what speed in Mach is the plane flying ? Speed of sound = 331. 4 m/s

2. Homework Equations

Machs = speed of plane / speed of sound

3. The Attempt at a Solution

I dont have any clue where to go with this, maybe find the angle of the cone ? it gave me an angle of like .14 degrees and an impossible answer of the plane speed.... dah

Thanks in advance