The distance between the two places is 480 meters. Xiao Ming and Xiao Hong set off from the two places at the same time and walk towards each other. Xiaoming walks 55 meters per minute, which is 10 meters less than Xiaohong's per minute. After how many minutes the two meet.
两地相距480米，小明和小红同时从两地出发，相对而行．小明每分钟行55米，比小红每分少行10米．经过多少分两人相遇．
<gadget id="calculator">55 + 55 + 10</gadget>
<output>120</output>

<gadget id="calculator">480 / 120</gadget>
<output>4</output>

<result>4</result>