railway bridge has a total length of 1150 meters. A train passes through the bridge. It takes 140 seconds for the train to get off the bridge from the beginning of the bridge, and the time for the whole train to be on the bridge is 90 seconds. So, what is the length of this train in meters?
一条铁路桥全长1150米，一列火车从桥上通过，测得火车从开始上桥到完全下桥共用140秒，而整列火车在桥上的时间是90秒．那么，这列火车的长度是多少米？
<gadget id="calculator">140 - 90</gadget>
<output>50</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">140 - 25</gadget>
<output>115</output>

<gadget id="calculator">1_150 / 115</gadget>
<output>10</output>

<gadget id="calculator">10 * 25</gadget>
<output>250</output>

<result>250</result>