The length of the railway between A and B is 15 centimeters drawn on a map with a scale of 1:3,000,000. How many centimeters should be drawn on a map with a scale of 1:1,000,000?
甲乙两城铁路长度画在比例尺是1：3000000的地图上是15厘米，画在比例尺是1：1000000的地图上，应画多少厘米？
<gadget id="calculator">15 * 3_000_000</gadget>
<output>45_000_000</output>

<gadget id="calculator">45_000_000 / 1_000_000</gadget>
<output>45</output>

<result>45</result>