From home to school, if Zhang Hua walks at a speed of 50 meters per minute, he will be 8 minutes late. If he walks at a speed of 60 meters per minute, he can arrive 5 minutes earlier. How many meters is Zhang Hua's home from the school?
张华从家到学校，如果用每分钟50米的速度行走，那么就要迟到8分钟，如果改用每分钟60米的速度行走，那么可以早到5分钟．张华家离学校有多少米？
<gadget id="calculator">5 * 60</gadget>
<output>300</output>

<gadget id="calculator">8 * 50</gadget>
<output>400</output>

<gadget id="calculator">300 + 400</gadget>
<output>700</output>

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

<gadget id="calculator">700 / 10</gadget>
<output>70</output>

<gadget id="calculator">50 * 70</gadget>
<output>3_500</output>

<gadget id="calculator">50 * 8</gadget>
<output>400</output>

<gadget id="calculator">3_500 + 400</gadget>
<output>3_900</output>

<result>3_900</result>