Approximate population of NYC = 20 million Assuming 40% of population rides subway everyday no. of passengers = 8 million Avg miles ridden by each passenger let

Approximate population of NYC = 20 million Assuming 40% of population rides subway everyday no. of passengers = 8 million Avg miles ridden by each passenger let's say is 10. Total miles ridden = 80 million miles. Way too many assumptions. Are they sensible? I don't know.