The CNR trains are supposed to approach crossings at 62 km/hr and begin soundingtheir train whistles. The whistle produces a loud sound at a frequency of 220 Hz. Theowners of the train suspect that the train engineers are exceeding the speed as theyapproach crossings. To test their assumptions the owners set up a receiver tomeasure the frequency of the approaching train whistle. As train #5 approaches, theobserved frequency of the train whistle is 235 Hz at the stationary receiver. The localspeed of sound is 340 m/s. Should the engineer be punished for speeding (how fastis the train going) or rewarded for obeying the rules and why?

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