On a map with a scale of 1:3000000, the distance between Shanghai and Hangzhou on the map is 5 cm. What is the actual distance between the two places? (Solve with ratio)
在比例尺是1：3000000的地图上，上海到杭州的图上距离是5厘米，求两地之间的实际距离是多少？(用比例解)
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">5 / (1/3_000_000) / 100_000</gadget>
<output>150</output>

<result>150</result>