Question

the perimeter of the hallway is 10 4/10 meters what is the width in meters

Answer 1

Considering that the hallway is rectangular in shape such that its perimeter is calculated by the equation, 
                          P = 2L + 2W
where P is perimeter, L is length, and W is width. Substituting the known values,
                            10.4 = 2L + 2W
Dividing both sides of the equation by 2,
                               5.2 = L + W
                                W = 5.2 - L