How long can wash a glass of a city,
Depends on how much the city's architectural glass area, how high the floor. Hard to calculate.
Depends on how much the city's architectural glass area, how high the floor. Hard to calculate.
A city of 3 million people, three people a room, an average of 15 square rooms, per capita 5 square, a square 6 minutes, then it takes 5000 hours to finish, provided that all people are involved
