It took a car 5 hours to drive from Jianhu to Nanjing, and 4 hours to travel from Nanjing to Shanghai at the same speed. The road from Jianhu to Nanjing is 340 kilometers long. How many kilometers is the road from Nanjing to Shanghai?
一辆汽车从建湖到南京，行驶了5小时，以同样的速度从南京到上海用了4小时．建湖到南京的公路长340千米，南京到上海的公路长多少千米？
<gadget id="calculator">340 / 5</gadget>
<output>68</output>

<gadget id="calculator">68 * 4</gadget>
<output>272</output>

<result>272</result>