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Mathematics, 01.01.2020 16:31 codyfore141

Aperson drives 15km to the shops at an average speed of 30km/h, then drives back at an average speed of 60km/h. what is their average speed over the two journeys?

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Aperson drives 15km to the shops at an average speed of 30km/h, then drives back at an average speed...

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