Because Xiao Ming gets up late, if he returns to school at a speed of 50 meters per minute, he will be late for 10 minutes; if he returns to school at a speed of 60 meters per minute, he will still be 5 minutes late. If you don't want to be late, how many meters should Xiao Ming walk at least per minute?
小明因为晚起床，如果以每分钟50米的速度回校，则迟到10分钟；如果以每分钟60米的速度回校，则仍迟到5分钟．如果想不迟到，小明至少每分钟走多少米．
<gadget id="calculator">50 * 10</gadget>
<output>500</output>

<gadget id="calculator">60 * 5</gadget>
<output>300</output>

<gadget id="calculator">500 - 300</gadget>
<output>200</output>

<gadget id="calculator">60 - 50</gadget>
<output>10</output>

<gadget id="calculator">200 / 10</gadget>
<output>20</output>

<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">25 * 60</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 / 20</gadget>
<output>75</output>

<result>75</result>