On a 1:160000000 map, the distance between A and B is 4.5 cm. What is the actual distance between A and B?
在一幅1：160000000的地图上，量得甲、乙两地的距离是4.5厘米．甲、乙两地的实际距离大约是多少．
<gadget id="calculator">1 / 160_000_000</gadget>
<output>1/160_000_000 = around 0</output>

<gadget id="calculator">4.5 / (1/160_000_000) / 100_000</gadget>
<output>7_200</output>

<result>7_200</result>