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Mathematics, 19.04.2021 09:00 victoriazh2005

a car travels the first 15 km of the journey at an average speed 60km/h and the remaining 40 km at an average speed of 30 km/h find the average speed of the whole journey

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a car travels the first 15 km of the journey at an average speed 60km/h and the remaining 40 km at a...
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