It takes 15 seconds for a train to cross a 200-meter bridge. If the speed of the train is increased by half, it will take 8 seconds for him to cross a 218-meter bridge. Find the original speed of the train?
一列火车通过200米的大桥要用15秒，如果火车的速度加快一半，他通过218米的大桥就用8秒，求火车原来的速度？
<gadget id="calculator">218 - 200</gadget>
<output>18</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">16 - 15</gadget>
<output>1</output>

<gadget id="calculator">18 / 1</gadget>
<output>18</output>

<result>18</result>