On a map with a scale of 1:3000000, the distance from city A to city B is 12 cm. A car travels from city A to city B at a speed of 90 kilometers per hour. After 3 hours, how far is the car from city B?
在比例尺1：3000000的地图上，量得从A城到B城的距离有12厘米．一辆汽车以每小时90千米的速度从A城到B城，3小时后，汽车离B城多少千米？
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">12 / (1/3_000_000) / 100_000</gadget>
<output>360</output>

<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">360 - 270</gadget>
<output>90</output>

<result>90</result>