There is a telephone pole every 60 meters next to the railway. In order to calculate the speed of the train, a passenger measures that it takes 1 minute from the first telephone pole to the 20th telephone pole. What is the speed of the train in meters per second?
铁路旁每隔60米有一根电线杆，某旅客为了计算火车的车速，测量出从经过第一根电线杆起到经过第20根电线杆止共用了1分钟．火车的速度是每秒多少米？
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">60 / 60</gadget>
<output>1</output>

<gadget id="calculator">19 * 1</gadget>
<output>19</output>

<result>19</result>