Xiao Huan stood beside the railway, and when a train passed by him, he looked at his watch, and when all the trains had passed by, he looked at his watch again, a total of 14 seconds. The train takes 49 seconds from the front of the train entering the bridge to the rear of the train leaving the bridge. The bridge is 700 meters long and the train moves forward at a constant speed. What is the length of the train?
小欢站在铁路旁，一列火车从他身边过时，他看了一下表，车尾全部过完时他又看了一下表，共14秒．这列火车从车头进大桥到车尾离开大桥，共用49秒，这座大桥长700米，火车匀速前进．火车的长度是多少？
<gadget id="calculator">49 - 14</gadget>
<output>35</output>

<gadget id="calculator">700 / 35</gadget>
<output>20</output>

<gadget id="calculator">14 * 20</gadget>
<output>280</output>

<result>280</result>