How to do the thinking problem of unit 6, unit 7 and unit A in the sixth grade of primary school mathematics?

Suppose they walked for t minutes at the same time, then Xiao Qiang walked for t-4 minutes for the second time. Because Xiaohong walked a certain distance and speed, it took Xiaohong the same time twice.

For Xiao Qiang, he traveled the same distance twice, namely.

79t=90(t-4)

So we get t = 360/11min.

So the distance between the two families is

(52+79)t = 47 160/ 1 1m

Huang Rong gave the question to Ying Gu.

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