Yes, it's the new scheme work put in for reducing hamster ball costs, ballsharing. I mean, most people run in hamster balls with more space than needed, no? Although it would more efficient if there was a bus route to carry all 50 people ngl.
Are you serious with your caption? The top row is the serious examples, the bottom row is the joke. XKCD is a comic strip that tells jokes occasionally.
Professional Cyclists: Elite professional cyclists can produce power outputs of 300 to 400 watts during races, with peak efforts exceeding 1,000 watts for short bursts (like sprinting).
Time Trials and Climbs: During time trials or climbs, trained cyclists can maintain higher power outputs for extended periods, often around 350 to 450 watts for well-trained athletes.
But then it tells me 40km/h assuming 400W which is obviously wrong. I guess you'd have to model that "tandem" in CAD and simulate the airflow to get accurate drag numbers
For space efficiency, yes. Bikes are actually better than walking for CO2 output. Your food has a CO2 cost, and bikes are really damn efficient at turning your food calories into forward momentum. Ebikes are even better on a per mile basis, but their higher manufacturing cost mean they never catch up to lifetime CO2 output of a regular bike. Still, whatever gets more people on bikes is a win in my book, ebike or otherwise.
Realistically, the 50 people riding a bus scenario will become 50 people riding a bus with rest of the road space occupied by 16-wheelers or other large transportation trucks