Xiao Ming looked at the telephone poles on both sides of the railway in the moving train. He found that it took exactly 4 minutes from the first telephone pole to the 45th. It is known that the distance between every two telephone poles is 50 meters. What is the speed in meters per minute.
小明在行驶的火车里看铁路两旁的电线杆，他发现从经过第一根电线杆到第45根，恰好是4分钟，已知每两根电线杆之间的距离是50米，火车行驶的速度是每分钟多少米．
<gadget id="calculator">45 - 1</gadget>
<output>44</output>

<gadget id="calculator">44 / 4</gadget>
<output>11</output>

<gadget id="calculator">50 * 11</gadget>
<output>550</output>

<result>550</result>