Question

Three switches are to be installed in a panel. The switches are each 21/2 inches wide. There will be 11/4 inches clearance between switches and 37/8 inches between any switch and the edge of the box. How wide is the box?

Answer 1

Do you mean?
2 1/2 inches wide
1 1/4 inches clearance
3 7/8 inches between

Answer 2

yes