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A construction worker drives to his work 13 km away at an average speed of 34 km/h. Before he gets out of his car he

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A construction worker drives to his work 13 km away at an average speed of 34 km/h. Before he gets out of his car he realizes he forgot his hard hat at home and drives back at 51 km/h. Assuming his time parked at work was insignificant, what was his average speed overall in km/h? 39.325 %

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