Question 280092
The separate sections of rail on a railroad track are 30 ft. long. As the train passes over the point where the sections are joined, there is an audible click. By what fraction must the number of clicks in a minute be multiplied to find the speed of the train in miles per hour?
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1 click per second = 60 clicks per minute = 30 ft/sec
30 ft/sec = 108000 ft/hr = 20.4545... miles/hr (225/11 mph)
--> 60 clicks/min = 225/11 mph
mph = 60*11/225 = 44/15 times clicks in 1 minute =~ 3
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3 clicks/min means you're moving ~1 mph