train is 360 meters long and travels 18 meters per second. The whole train passes a bridge whose length is (1/4) the length of the train. How much time is needed?
一列火车长360米，每秒钟行驶18米，全车通过一座长是车身长的(1/4)的桥．需要多少时间？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">360 * (1/4)</gadget>
<output>90</output>

<gadget id="calculator">360 + 90</gadget>
<output>450</output>

<gadget id="calculator">450 / 18</gadget>
<output>25</output>

<result>25</result>