​Beijing notebook: mathematical and hygienic problem

A hotel has 17 floors with about thirty rooms per floor. His clients more or less all arrived at the same time for a stay of about three weeks with suitcases that could contain enough clothes to last seven to ten days.

How long will it be before the situation becomes tense, or hygienically questionable, knowing that there is only one small washing machine and dryer in the whole hotel, and that it takes about an hour to complete a full cycle?

This text was funded with support from the Transat International Journalism Fund.The duty.

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