Take a map with a scale of 1:15000000, and measure the distance between A and B as 5.6 cm. What is the actual distance between A and B in km?
把一幅比例尺是1：15000000的地图上，量得甲乙两地间的距离是5.6cm，甲乙两地实际距离是多少km．
<gadget id="calculator">1 / 15_000_000</gadget>
<output>1/15_000_000 = around 0</output>

<gadget id="calculator">5.6 / (1/15_000_000) / 100_000</gadget>
<output>840</output>

<result>840</result>