Mathematics, 31.07.2019 17:50, aesthvx44

Along distance runner starts a race at 1 m/s. he increases his speed to 3 m/s during the middle of the race and slows down to 2 m/s at the end. in total he runs 2,000 meters in 12 minutes (720 seconds). what is his average speed?

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Along distance runner starts a race at 1 m/s. he increases his speed to 3 m/s during the middle of t...