One fathom is equal to six feet or 1.8288 meters.
A fathom is 6 feet. So it's about 1.80 metres.
26.25 feet
Actually that varies from country to country, and in part from school to school. Here in Bolivia, my children went to school about 5 hours a day, 5 days a week.
80 years, since a decade is 10 years.