On the plan with a scale of 1:3000, the length of a bridge is measured to be 7 cm. How many meters is the actual length of the bridge?
比例尺是1：3000的平面图上，量得一座大桥的长度是7厘米，这座大桥的实际长度是多少米？
<gadget id="calculator">1 / 3_000</gadget>
<output>1/3_000 = around 0.000333</output>

<gadget id="calculator">7 / (1/3_000)</gadget>
<output>21_000</output>

<gadget id="calculator">21_000 / 100</gadget>
<output>210</output>

<result>210</result>