School starts at 8:00. Xiaohua starts from home at 7:30 and walks 50 meters per minute, and arrives at school 12 minutes late. If he wants to arrive at school 2 minutes earlier, how many meters does he have to walk per minute?
学校8：00上课．小华从家中7：30出发每分钟走50米，到学校要迟到12分钟．如果要提前2分钟到达学校，他每分钟要走多少米？
<gadget id="calculator">50 * 42</gadget>
<output>2_100</output>

<gadget id="calculator">42 - 12 - 2</gadget>
<output>28</output>

<gadget id="calculator">2_100 / 28</gadget>
<output>75</output>

<result>75</result>