2. The distance from Mr. Wang's home to his workplace is $3500 \mathrm{~m}$, and Mr. Wang leaves home on foot to go to work every morning at $7: 30$, arriving at his workplace between $8: 10$ (inclusive) and $8: 20$ (inclusive). If Mr. Wang's walking speed is set as $x \mathrm{~m} / \mathrm{min}$, then the range of Mr. Wang's walking speed is ( ).
(A) $70 \leqslant x \leqslant 87.5$
(B) $x \leqslant 70$
(C) $70 \leqslant x$ or $x \geqslant 87.5$
(D) $x \geqslant 87.5$
2. A.

According to the problem, the time Mr. Wang spends on his way to work is between $40 \mathrm{~min}$ and $50 \mathrm{~min}$, so $\frac{3500}{50} \leqslant x \leqslant \frac{3500}{40}$, which means $70 \leqslant x \leqslant 87.5$.