Today Xiaohua went to the library to read a book. After walking 500m on the road, he stopped to rest for ten minutes and continued on his way. After 30 minutes, he arrived at the library. After reading for an hour, he returned home after 20 minutes. Xiaohua walks 10m per minute on average, how many kilometers does Xiaohua walk?
今天小华去图书馆看书，在路上走了500m后停下来休息了十分钟又继续赶路，经过三十分后到达图书馆，看了一个小时的书，经过二十分回到了家，已知小华平均每分走10m，小华走了多少千米．
<gadget id="calculator">30 + 20</gadget>
<output>50</output>

<gadget id="calculator">10 * 50</gadget>
<output>500</output>

<gadget id="calculator">500 + 500</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 / 1_000</gadget>
<output>1</output>

<result>1</result>