The distance between A and B is 740 km. Uncle Wang drove from city A to city B at two speeds for 8 hours. He drove a total of 500 kilometers in the first 5 hours. How many kilometers per hour will he drive in the rest?
甲乙两城相距740千米．王叔叔开车用两种速度从甲城到乙城共用了8小时，前5小时共行了500千米，后面每小时行多少千米？
<gadget id="calculator">740 - 500</gadget>
<output>240</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">240 / 3</gadget>
<output>80</output>

<result>80</result>