On a map with a scale of (1/3000000), the distance between A and B is 4.5 cm. A car travels from point A to point B at a speed of 60 kilometers per hour. How long does it take to get there?
在比例尺是(1/3000000)的地图上，量得A、B两地的距离是4.5厘米．一辆汽车以每小时60千米的速度从A地开往B地，几小时可以到达？
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">4.5 / (1/3_000_000) / 100_000 / 60</gadget>
<output>2.25</output>

<result>2.25</result>