On a map with a scale of (1/3000000), the distance from A to B is 15 cm. How many hours does it take for an airplane to fly from point A to point B at a speed of 450 km/h?
在一幅比例尺为(1/3000000)的地图上，甲地到乙地的距离是15厘米．一架飞机以每小时450千米的速度从甲地飞往乙地，需几小时？
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">15 / (1/3_000_000) / 100_000</gadget>
<output>450</output>

<gadget id="calculator">450 / 450</gadget>
<output>1</output>

<result>1</result>