Where does the 60ft/minute ascent rule come from?

[mbacarella]

I guarentee no one in this thread who passed high school algebra was confused by what Richard said.

No, most people won't admit they're confused because they don't want to be judged.

Me? I don't care if people judge me, I'd rather be clear on the answer than worry about what people will think about me.

Thanks for the explanation.