person is walking west to east along a straight path parallel to the railway. At this time, a train with a length of 520 meters is coming from behind. The person measures the time for the entire train to pass 42 seconds during the journey, and at this time In a period of time, he walked 68 meters, what is the speed of the train?
某人沿着一条与铁路平行的笔直的小路由西向东行走，这时有一列长520米的火车从背后开来，此人在行进中测出整列火车通过的时间为42秒，而在这段时间内，他走了68米，则火车的速度是多少？
<gadget id="calculator">520 + 68</gadget>
<output>588</output>

<gadget id="calculator">588 / 42</gadget>
<output>14</output>

<result>14</result>