train moves down the track at 107 mph when the engineer sees a second train, on a side track, headed the same way in front at the slower speed of 91 mph. The engineer decides to blow his horn as a friendly “hello.” If, relative to the first engineer, the horn makes a sound at 415 Hz, what will be the frequency of the sound relative to the second train engineer? (The speed of sound travels at 760 mph or 340 m/s.)

train moves down the track at 107 mph when the engineer sees a second train, on a side track, headed the same way in front at the slower speed of 91 mph. The engineer decides to blow his horn as a friendly “hello.” If, relative to the first engineer, the horn makes a sound at 415 Hz, what will be the frequency of the sound relative to the second train engineer? (The speed of sound travels at 760 mph or 340 m/s.)

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