Two trains A and B depart from two cities 1620 kilometers apart at the same time, and meet after 6 hours. It is known that car A is faster than car B per hour (1/4), how many kilometers is the speed of car B?
甲、乙两列火车同时从相距1620千米的两城相对开出，经过6小时相遇．已知甲车每小时比乙车快(1/4)，乙车的速度是多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 6</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">6 + (3/2) + 6</gadget>
<output>27/2 = around 13.5</output>

<gadget id="calculator">1_620 / (27/2)</gadget>
<output>120</output>

<result>120</result>