On a map with a scale of 1:4000000, the measured distance between A and B is 8.4 cm. How many kilometers is the actual distance between the two places?
在比例尺是1：4000000的地图上，量得甲乙两地之间的距离是8.4厘米，两地之间的实际距离是多少千米？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">8.4 / (1/4_000_000) / 100_000</gadget>
<output>336</output>

<result>336</result>