Triangle def is similar to triangle ghk. what is the value of df if gk is 3.4 inches, ef is 2.5 inches, and hk is 9 inches

Suppose you are analyzing the relationship between time and distance given in a table,and there are 4 values for each quantity.you divide distance 2 minus distance 1 by time 2 minus time 1.you then divide distance 4 minus distance 3 by time 4 minus time 3 and get a different answer.what can you say about the relationship?