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A runner runs the first 400m of a race in 80s, the second 400m in 70s and the final 800m in 130s. What was her average speed for this run?
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A runner runs the first 400m of a race in 80s, the second 400m in 70s and the final 800m in 130s. What was her average speed for this run?

User Markwatson
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The runners average speed would be 330 km/h for the run .
User Jayson Tamayo
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