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1. Three persons walk the same distance x along a street at speeds of 2 km/h, 3 km/h, and 4 km/h respectively. Their average speed, in km/h, is:
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1. Three persons walk the same distance x along a street at speeds of 2 km/h, 3 km/h, and 4 km/h respectively. Their average speed, in km/h, is:
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