Human head hair grows by about one centimetre per month.

a) Indicate the growth rate in millimetres per hour.

The growth rate in millimetres per hour is



[[$ v ≈ $]] mm/h

b) By how many millimetres does your hair grow during an [[$ 6 $]] hour school day?



[[$ s ≈ $]] mm.

c) How long does it take for your hair to grow one meter, if it is never cut?



[[$ t ≈ $]] years.