On a map with a scale of 1:1,000,000, the distance between Wuxi and Suzhou is 4.2 cm. What is the actual distance in kilometers between Wuxi and Suzhou?
在一幅比例尺为1：1000000的地图上，量得无锡、苏州两地之间的距离是4.2厘米．无锡、苏州两地之间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">4.2 / (1/1_000_000) / 100_000</gadget>
<output>42</output>

<result>42</result>