To pass a physical fitness test, Marcella must run 1.00 km at an average speed of 3.33

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To pass a physical fitness test, Marcella must run 1.00 km at an average speed of 3.33 m/s. She runs the first 0.500 km at an average of 4.20 m/s. What should be her average speed over the remaining 0.500 km in order to finish with an overall average speed of 4.00 m/s?

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