jgilmour466 jgilmour466

17-11-2016
Mathematics

contestada

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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Noah11012 Noah11012

17-11-2016

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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