A train on one track moves in the same direction as a, Physics

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A train on one track moves in the same direction as a

A train on one track moves in the same direction as a second train on the adjacent track. The first train, which is ahead of the second train and moves with a speed of 30.4 m/s, blows a horn whose frequency is 124 Hz. If the frequency heard on the second train is 145 Hz, what is its speed?

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