The distance between the two places is 270 meters, and Xiaodong and Xiaoying are walking towards each other from both places at the same time. Xiaodong walks 50 meters per minute, and Xiaoying walks 40 meters per minute. After a few minutes, the two meet? (Solve by two methods of arithmetic and equation)
两地相距270米，小东和小英同时从两地相向而行．小东每分钟行50米，小英每分钟行40米，经过几分钟两人相遇？(用算术、方程两种方法解答)
<gadget id="calculator">50 + 40</gadget>
<output>90</output>

<gadget id="calculator">270 / 90</gadget>
<output>3</output>

<result>3</result>