In western movies, the hero sometimes detects an approaching trainby \"listening

Question

In western movies, the hero sometimes detects an approaching trainby "listening" to the railroad tracks. If the tracks are made ofsteel, how many times faster does sound travel in the tracks thanin air? (Use 5790 m/s as the speed of sound in steel, and 343 m/sas the speed of sound in air.)
1
this is a lil bit of a messed up question,something about harmonic double wavelength ?
In western movies, the hero sometimes detects an approaching trainby "listening" to the railroad tracks. If the tracks are made ofsteel, how many times faster does sound travel in the tracks thanin air? (Use 5790 m/s as the speed of sound in steel, and 343 m/sas the speed of sound in air.)
1
this is a lil bit of a messed up question,something about harmonic double wavelength ?

Explanation / Answer

It wants the ratio between the two speeds. Simply dividethem to get: (5790 m/s) / (343 m/s) = 16.9 So, sound travels 16.9 times faster in the tracks than inair.

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