Yoohoo, hey, I have another ridiculously complicated problem that has two parts to it.
Here's a chance to get two medals, btw
To get to school from home, Lana has to cycle one mile up a hill and one mile down the other side. She averages 10mph on the way up the hill.
Part the first: What constant speed must Lana go down the hill if she wishes to average 12mph for the whole journey?
Part the second: Explain why it's impossible for Lana to average 20mph for the entire journey.
Thanks :)

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