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Doppler Shift question

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A train moving toward a detector at 31m/s blows a 305-Hz horn. What frequency is detected by a statiory train?

Using the equation f´= f(V + Vd/ V - Vs)

The answer is supposed to be 340-Hz but I don't understand how to get it. Mind helping me out?
 

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anyone know?
 
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I do not recognize the formula. My scientific encyclopedia gives this for the source approaching the detector:

[tex] f' = f(\frac{1}{1-\frac{v}{v_s}})[/tex]

where v_s is the speed of sound in air.
 

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