The expressway from Shanghai to Nanjing is 270 kilometers long. A car has been driving from Shanghai for 3 hours, at 85 kilometers per hour. How many kilometers is this car from Nanjing?
上海到南京高速公路长270千米，一辆汽车从上海开出，已经行驶了3小时，每小时行驶85千米．这辆汽车离南京还有多少千米？
<gadget id="calculator">85 * 3</gadget>
<output>255</output>

<gadget id="calculator">270 - 255</gadget>
<output>15</output>

<result>15</result>