Two trains depart opposite from each other at the same time, A travels 56 kilometers per hour, and B travels 64 kilometers per hour. If the distance between the two places is 720 kilometers, how many hours will it take to meet?
两列火车同时从两地相对开出，甲每小时行56千米，乙每小时行64千米．如果两地相距720千米需要几小时相遇？
<gadget id="calculator">56 + 64</gadget>
<output>120</output>

<gadget id="calculator">720 / 120</gadget>
<output>6</output>

<result>6</result>