The distance between A and B is 1200 meters. Two people start from A and B at the same time and meet each other after 10 minutes. If two people still set off from places A and B at the same time after increasing their speed by 50%, how many seconds after departure will they meet?
甲、乙两地相距1200米，两人分别从甲、乙两地同时相向出发，经过10分钟相遇．若两人各自提速50%后仍从甲、乙两地同时相向出发，则出发后几秒相遇？
<gadget id="calculator">1_200 / 10</gadget>
<output>120</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">120 * (3/2)</gadget>
<output>180</output>

<gadget id="calculator">180 / 60</gadget>
<output>3</output>

<gadget id="calculator">1_200 / 3</gadget>
<output>400</output>

<result>400</result>