Method 1:

Let him walk the remaining half distance at the speed of X km/h, and then

12x/60≥2.4- 1.2

X≥6 of the solution.

A: He covered the remaining half of the distance at a speed of at least 6 kilometers per hour.

Method 2: Let him walk the remaining half distance at the speed of X km/min, and then

12x=2.4- 1.2

X=0. 1。

So as long as the walking speed is greater than 0. 1 km/min, Xiaohua can get to school on time.

Answer: He walked the remaining half at least 0. 1 km/min.

(Note: Any correct solution can be averaged, and the result is100m/min; 5/3 m/s)

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