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## Homework Statement

A supersonic plane flies at Mach 3 at an altitude of 20,000 m. A person on the ground sees the plane directly overhead. How much time passes the before she hears the sonic boom?

## Homework Equations

f=fo(v+-vo/v-+vs)

## The Attempt at a Solution

I don't really know how to start up with this one, I was hoping for some help here.