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How do I find the speed of this train?

  1. Feb 13, 2014 #1
    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
     
  2. jcsd
  3. Feb 13, 2014 #2

    Simon Bridge

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    Welcome to PF;
    Please show an honest attempt at the problem ... what are the main physical principle and effect that is in play here?
     
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