On a map with a scale of 1:300,000, the road from Baimangpu to Daoxian County is measured to be 4 cm long. If a car travels from Baimangpu to Daoxian County at a speed of 60 kilometers per hour, how many hours will it take to get there?
在比例尺是1﹕300000的地图上，量得白芒铺到道县县城的公路长4厘米，一辆汽车以每小时60千米的速度从白芒铺去道县县城，多少小时可以到达？
<gadget id="calculator">1 / 300_000</gadget>
<output>1/300_000 = around 0.000003</output>

<gadget id="calculator">4 / (1/300_000) / 100_000 / 60</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>