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Mathematics, 02.03.2021 19:40 didirose

Andra travels 90 miles at an average speed of 70 mph. She then travels a further 70 miles.
The average speed for the entire journey is 63 mph.
Assuming Andra didn't stop, what was her average speed for the final 70 miles to 2 dp?

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Andra travels 90 miles at an average speed of 70 mph. She then travels a further 70 miles.
T...

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