When an Airplane Flies Faster Than the Speed of Sound

When an airplane flies faster than the speed of sound, the sound waves that are formed take on a cone shape, and where the cone hits the ground, a sonic boom is heard. If

Is the angle of the vertex of the cone, then
Sin

Where V is the speed of the plane and M is the mach number, then what is the speed of the plane if the plane is flying at mach 1.6?
Speed of the plane is __________ m/sec.

A) Speed of the plane is 528 m/sec.
B) Speed of the plane is 206 m/sec.
C) Speed of the plane is 0.005 m/sec.
D) Speed of the plane is 52.8 m/sec.