The length of the rectangular room is 12 ft
To find the length of the rectangular room by using the formula for the area of a rectangle:
Area = Length * Width
Given that Area of a rectangular room = 120

Width = 10 ft
Length = ?
To calculate the length of the rectangular room,
Length = Area/Width
Length = 120/10
Length = 12 ft
Therefore, the length of the rectangular room is 12 ft