We are told that to calculate the depth d of snow, in centimeters, that accumulates in Harper's yard during the first h hours of a snowstorm we can use the equation:
.
To find number of hours it will take for 1 centimeter of snow to accumulate in Harper's yard we will substitute d=1 in our given equation.

Dividing both sides of our equation by 5 we will get,
Therefore, it will take
of an hour or 12 minutes for 1 centimeter of snow to accumulate in Harper's yard.