Second grade physics variable speed linear motion, when the distance is different, time is different, the average speed formula and detailed explanation, the best example

In S1, the speed is V1; in S2, the speed is v2. Then the average speed is v = (S1 + S2) / (S1 / V1 + S2 / V2)
For example: when a person walks, the speed of the first 100 meters is 1 m / s, and then he walks 300 meters at 2 m / s?
Use the above formula: v = s / T
=(s1+s2)/(s1/v1+s2/v2)
=(100 + 300) / (100 / 1 + 300 / 2) = 1.6 (M / s)
A: his average speed is 1.6 m / s

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