A train travels across two bridges at the same speed. The first bridge is 360 meters long and it takes 24 seconds. The second bridge is 480 meters long and it takes 28 seconds. How long is this train?
一列火车以同样的速度行驶过两座大桥，第一座大桥长360米，用了24秒，第二座桥长480米，用了28秒．这列火车长多少米？
<gadget id="calculator">480 - 360</gadget>
<output>120</output>

<gadget id="calculator">28 - 24</gadget>
<output>4</output>

<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<gadget id="calculator">30 * 24</gadget>
<output>720</output>

<gadget id="calculator">720 - 360</gadget>
<output>360</output>

<result>360</result>