Measured from a map with a scale of 1:500,000, the distance between Xixiang and Luojiaba is 9cm, and the bicycle travels 22.5 meters per hour. How long does it take to get from Xixiang to Luojiaba?
从比例尺是1：500000的地图上量得西乡到骆家坝相距9cm，骑自行车每时行22.5行米，从西乡到骆家坝需要几时？
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">9 / (1/500_000) / 100_000 / 22.5</gadget>
<output>2</output>

<result>2</result>