Markers Two
You can determine the speed of a car by measuring the time it takes to travel between mile markers on a?
highway. a) How many seconds should elapse between two consecutive mile markers if the car’s avg. speed is 65 mi/h? b) What is the car’s avg. speed if it takes 65 seconds to travel between the mile markers? I’d appreciate any help, thank you
1 minute has 60 seconds and so in the first case,
a) it should take less than a minute. 60/65 minutes and multiplying by 60 we get 55.4 seconds
b) the average speed is <60 mph since 1 mile takes 65 seconds and so in 60 seconds, the car would go 60/65 multiplied by 60 miles per hour. 60 x 60 / 65 = 720/13 = 55.4 mph approx.
Note that in both cases, we get the same numerical answer but the units and the significance are different.
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