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Mathematics 21 Online
OpenStudy (anonymous):

A car approaches you with its horn blowing. The observed frequency is 503.7 Hz. Assume the speed of sound is 1100 ft/s. The car's horn has a frequency of 450 Hz. How fast is the car going? Express your answer in mph.

OpenStudy (irishboy123):

(1- 450/503.7)*1100

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