Answer:
6 cm
Step-by-step explanation:
Given that:
A line that contains the points R, S and T.
Distance between R and S = 
Distance between S and T = 
To find:
The distance between S and T = ?
Solution:
The given situation and dimensions can be represented in the form of a diagram as shown in the attached diagram.
As per given statement and in the diagram, we can deduce that the sum of distance between R and S, S and T is equal to distance between R and T.
i.e. RS + ST = RT

ST = 3
= 3
2 = <em>6 cm</em>
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Therefore, the answer is:
Distance between S and T is <em>6 cm</em>.