train is 240 meters long and its speed is 60 km/h, and the speed of an off-road vehicle is 80 km/h. When the train is moving, the off-road vehicle and the train go in the same direction. The off-road vehicle crosses the rear of the train to the front of the train. How much time is it.
一列火车长240米，速度为60千米/时，一辆越野车的车速为80千米/时，当火车行进时，越野车与火车同向而行，越野车越过列车尾至车头，需要的时间为多少．
<gadget id="calculator">240 / 1_000</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">(6/25) / 20</gadget>
<output>3/250 = around 0.012</output>

<result>3/250 = around 0.012</result>