Xiaoqiang and Xiaohua walk from point A to point B at the same time. Xiaohua arrives at point B first and returns immediately, and meets Xiaoqiang. At this time, Xiaoqiang walked 8.4 kilometers, 3.2 kilometers less than Xiaohua. How many kilometers are there between A and B?
小强和小华两人同时步行从A地到B地，小华先到B地后立即返回，和小强相遇．此时，小强走了8.4千米，比小华少走了3.2千米．A、B两地相距多少千米？
<gadget id="calculator">3.2 / 2</gadget>
<output>1.6</output>

<gadget id="calculator">8.4 + 1.6</gadget>
<output>10</output>

<result>10</result>