How do I find the speed of this train?

1. The problem statement, all variables and given/known data

Two train whistles have an identical frequency of 246 Hz. Train A is motionless in the station and sounds its whistle. Meanwhile, Train B is pulling into the station and sounds its whistle. The conductor of Train B hears 5.39 beats every second. How fast is Train B moving? The speed of sound is 340 m/s.

2. Relevant equations

f’ = f (v+0 / v-vs)

3. The attempt at a solution

http://ift.tt/1eTIRBA

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