According to "Xiaohua rides from home to grandma's house, averagely travels 200 meters per minute, arrives in 45 minutes, and now travels 4 kilometers", raises mathematical problems and answers them.
根据"小华从家骑车去姥姥家，平均每分钟行200米，45分钟到达，现在已行4千米"提出数学问题并解答．
<gadget id="calculator">200 * 45</gadget>
<output>9_000</output>

<gadget id="calculator">4 * 1_000</gadget>
<output>4_000</output>

<gadget id="calculator">9_000 - 4_000</gadget>
<output>5_000</output>

<result>5_000</result>