It is 305 kilometers from Hefei to Huaibei via Suzhou. A train from Hefei-Suzhou-Huaibei has been running for 4.5 hours to Suzhou Station. It is known that the train travels x kilometers per hour on average. How many kilometers does the train have to travel from Suzhou Station to Huaibei Station? (results in letters)
从合肥经宿州到淮北305千米．一列从合肥-宿州-淮北的火车运行了4.5小时到宿州站，已知该火车平均每小时行驶x千米，问该火车从宿州站到淮北站还要行驶多少千米？(结果用字母表示)
<gadget id="calculator">305 - 4.5</gadget>
<output>300.5</output>

<result>300.5</result>