The scale of a picture is 1:6000000. The distance between city A and city B on this picture is 7.5 cm. What is the actual distance in kilometers?
一幅图的比例尺是1：6000000，在这幅图上A市到B市的距离是7.5厘米，它们的实际距离是多少千米．
<gadget id="calculator">1 / 6_000_000</gadget>
<output>1/6_000_000 = around 0</output>

<gadget id="calculator">7.5 / (1/6_000_000) / 100_000</gadget>
<output>450</output>

<result>450</result>