On the traffic map with a scale of (1/1000000), the length of the highway from Yunyang to Wanzhou is 4.5 cm. What is the actual distance in kilometers from Yunyang to Wanzhou?
在比例尺是(1/1000000)的交通地图上量得云阳到万州公路的长是4.5厘米，云阳到万州公路的实际距离是多少千米．
<gadget id="calculator">1 / 1_000_000</gadget>
<output>1/1_000_000 = around 0.000001</output>

<gadget id="calculator">4.5 / (1/1_000_000) / 100_000</gadget>
<output>45</output>

<result>45</result>