Student A and student B start from home at the same time and walk toward each other. Student A walks 52 meters per minute, and student B walks 70 meters per minute. The two meet at point A on the way. If student A starts 4 minutes earlier, and the speed remains the same , student B changes to walk 90 meters per minute, and the two still meet at A. How many meters are there between the homes of student A and student B?
学生甲和学生乙同时从家里出发相向而行，学生甲每分钟走52米，学生乙每分钟走70米，两人在途中的A处相遇，若学生甲提前4分钟出发，且速度不变，学生乙每分钟改为走90米，则两人仍在A处相遇，学生甲和学生乙两人的家相距多少米？
<gadget id="calculator">52 + 70</gadget>
<output>122</output>

<gadget id="calculator">70 * 4</gadget>
<output>280</output>

<gadget id="calculator">90 - 70</gadget>
<output>20</output>

<gadget id="calculator">280 / 20</gadget>
<output>14</output>

<gadget id="calculator">14 + 4</gadget>
<output>18</output>

<gadget id="calculator">122 * 18</gadget>
<output>2_196</output>

<result>2_196</result>