This is, of course, a trick question. The simple answer is 12, because the circumference of the park is 420m and 12 x 420m is 5040m. However, we are not told how close to the edge the runner is able to run, nor whether he (or she) rounds off the corners. If, for example, the park is bounded by a fence, the runner may have to run 1m inside the fence and will almost certainly not run completely in to each corner. Adjusting for these factors could reduce the distance run per lap to 410m or less, in which case an additional lap will be necessary. In fact, if the actual distance run is less than 416.67m per lap, then 13 laps must be run.
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