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10 August, 13:54

A person 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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  1. 10 August, 16:44
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    30 km/h to the store. 60 km/h back from the store.

    (60 + 30) / 2

    We use the mean average formula.

    90 / 2

    Final answer: 45
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