John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?
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Word Problem page 19John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a
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