The answer is “math.” Ain’t it always? As soon as the race was over, elite competitors began complaining that the course definitely seemed a touch too long given their race time and effort. Experienced local observers noticed that top times were, indeed, unexpectedly slow. Dozens of amateurs with GPS-equipped watches echoed those complaints, showing that their devices indicated both the full race distance and the half-marathon course to be anywhere from a half-kilometre to a kilometre too long. Some people who didn’t even run the race turned to Google Maps, plotted the half-marathon course, and found that it seemed to be about 700 metres longer than the correct 21.1 km.
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