Draw the distance of 15 kilometers on the ground on the map with a line segment of 3 cm. Then, the line segment of 0.5 cm on this map represents the actual distance in meters.
把地面15千米的距离用3厘米的线段画在地图上，那么，这幅地图上0.5厘米的线段代表实际距离多少米．
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">5 * 0.5 * 1_000</gadget>
<output>2_500</output>

<result>2_500</result>