From A to B, Li Ming travels 1 km per minute for the first half of the time, and 0.8 km per minute for the second half of the time. The distance between A and B is 63 kilometers. How many minutes did it take Li Ming to travel from A to B?
李明从A地到B地，前一半时间每分钟行1千米，后一半时间每分钟行0.8千米．A、B两地相距63千米，李明从A地到B地一共用了多少分钟？
<gadget id="calculator">1 + 0.8</gadget>
<output>1.8</output>

<gadget id="calculator">1.8 / 2</gadget>
<output>0.9</output>

<gadget id="calculator">63 / 0.9</gadget>
<output>70</output>

<result>70</result>