Posted by Elizabeth on Wednesday, September 26, 2012 at 1:23pm.
since there are 60 minutes in an hour, the speed can be expressed as 20/60 mi/min = 1/3 mi/min
after t minutes, the distance traveled is thus t/3 miles = 1760t feet
using a right triangle, then it is clear that
d(t) = √(180^2 + (1760t)^2) feet
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