The express train and the local train leave at the same time from places A and B which are 620 kilometers apart. The express train travels 68 kilometers per hour and the slow train travels 56 kilometers per hour. When they met, how many kilometers was the express train from place B?
快车和慢车同时从相距620千米的甲乙两地相对开出，快车每小时行68千米，慢车每小时行56千米．相遇时，快车离乙地多少千米？
<gadget id="calculator">68 + 56</gadget>
<output>124</output>

<gadget id="calculator">620 / 124</gadget>
<output>5</output>

<gadget id="calculator">5 * 68</gadget>
<output>340</output>

<gadget id="calculator">620 - 340</gadget>
<output>280</output>

<result>280</result>