Rails on a line are 12.5 m long, and a passenger hears a click each time the wheels cross a joint. He counts 72 clicks a minute. At what speed is the train moving?

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Accepted Answer

54 km/h. 72 rail lengths a minute =72×12.5=900 m/min =15 m/s =54 km/h. (15 is the speed in m/s.)

Rails on a line are 12.5 m long, and a passenger hears a click each time the wheels cross a joint. He counts 72 clicks a minute. At what speed is the train moving?

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