A and B are walking toward each other from two places at the same time. A travels 5 kilometers per hour and B travels 4.3 kilometers per hour. When the two meet, B travels 2.1 kilometers less than A. How many kilometers are the distance between the two places?
甲、乙两人同时从两地相向而行．甲每小时行5千米，乙每小时行4.3千米．两人相遇时乙比甲少行2.1千米．两地相距多少千米？
<gadget id="calculator">5 + 4.3</gadget>
<output>9.3</output>

<gadget id="calculator">5 - 4.3</gadget>
<output>0.7</output>

<gadget id="calculator">2.1 / 0.7</gadget>
<output>3</output>

<gadget id="calculator">9.3 * 3</gadget>
<output>27.9</output>

<result>27.9</result>