Two trains are running towards each other from A and B at the same time. One train travels 63 kilometers per hour, and the other train travels 58 kilometers per hour. After 3 hours, the two trains meet. How many kilometers are there between A and B?
两列火车从甲乙两地同时相对而行，一列火车每小时行63千米，另一列火车每小时行58千米，3小时后两车相遇．甲乙两地相距多少千米？
<gadget id="calculator">63 + 58</gadget>
<output>121</output>

<gadget id="calculator">121 * 3</gadget>
<output>363</output>

<result>363</result>