>Are they the same? By your logic, it should be.

That's not what I said. You can drive a car at 50mph for 10min, right? You can also type at 70wpm for 30s. That's all I said. You can get a word per minute value for a duration that's shorter than a minute, with a cross-multiplication. I've never said the typing speed would be the same if OP tried a longer test, I actually agree with you on that point. It's just the way you phrased it.