According to the meaning of the question, Xiaohong's speed is the same, and the distance she walks is the same, so Xiaohong's time is the same, that is, she walks for x minutes.

Then the movement of Xiao Qiang can be expressed as: 70*X=90*(X-4).

So X= 18.

So the distance is 18 * (52+70) = 2 196m.