train departs from station A at 4:30 p.m. and travels 120 kilometers per hour. After one hour, another train departs from station B at the same speed. The two trains meet at 9:30 p.m. How many kilometers is the length of the railway between Station B and Station B?
一列火车于下午4时30分从甲站开出，每小时行120千米，经过1小时后，另一列火车以同样的速度从乙站开出，晚上9时30分两车相遇，问甲、乙两站铁路长是多少千米？
<gadget id="calculator">120 * 5</gadget>
<output>600</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">120 * 4</gadget>
<output>480</output>

<gadget id="calculator">600 + 480</gadget>
<output>1_080</output>

<result>1_080</result>