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Here is the question: A reconnaissance plane flies 520 km away from its base at 200 km/h, then flies back to its base at 400 km/h. What is its average speed?

Okay so, 1040 is the total distance. I have to divide that by time...2hrs...I know the answer is roughly 267 km/h. But I cannot remember how to find this!

Thanks for all the help!