The long-distance bus from A to B originally took 8 hours to travel. After the highway was opened, the distance was nearly 60 kilometers, and the average speed increased by 30 kilometers per hour, and it only took 5 hours to arrive. What is the length of the highway between A and B?
从甲地到乙地的长途汽车原需行驶8小时，开通高速公路后，路程近了60千米，而车速平均每小时增加了30千米，只需5小时即可到达．甲、乙两地之间的高速公路长多少千米．
<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<gadget id="calculator">150 + 60</gadget>
<output>210</output>

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

<gadget id="calculator">210 / 3</gadget>
<output>70</output>

<gadget id="calculator">70 * 8</gadget>
<output>560</output>

<gadget id="calculator">560 - 60</gadget>
<output>500</output>

<result>500</result>