Zhang Chen is going to visit Yongchuan Wildlife Park on New Year’s Day. The journey from Zhongxian County to the zoo is 284km, and a bus travels 142km in 2 hours. At this speed, how many hours will it take to get there?
张晨准备元旦到永川野生动物园去参观，忠县到动物园全程284km，一辆客车2小时行驶了142km，照这样的速度，几小时能到达？
<gadget id="calculator">142 / 2</gadget>
<output>71</output>

<gadget id="calculator">284 / 71</gadget>
<output>4</output>

<result>4</result>