a) Notice that each long rectangle represents one unit each, and they are divided into 5 equal segments, as shown below
Therefore, each unit is divided into 5 parts, there are two units; then, the diagram represents 2 units divided into 5 (2÷5).
b) In the case of the unitary rectangle at the bottom of the drawing, each section in orange represents one unit divided by 5 (1/5).
We have two unitary rectangles; therefore, the 2 blue regions (for example) represent 1/5+1/5=2/5
Each subdivision represents 1/5, 2 of those represent 2/5.
Remember that 2÷5=2/5