My main two puzzles with Google Maps are: - on my timeline I have a few driving and motorcycling, and I have neither of those, I only bike to work. But my puzzl

My main two puzzles with Google Maps are: - on my timeline I have a few driving and motorcycling, and I have neither of those, I only bike to work. But my puzzle here is: how do they know that someone is riding a motorcycle or a car? - when I ask it for walking routes, the estimated time is always way longer than my walking time. I get to the destination in half of time. So what do they do with all the tracking?