A and B walk towards each other from A and B. A walks 3 kilometers per hour, and B walks 2 kilometers per hour. When they met, they were 3 kilometers away from the midpoint. How far is the distance between A and B?
甲、乙两人从A、B两地步行相向而行，甲每小时走3千米，乙每小时走2千米．相遇时距离中点有3千米．问A、B两地相距多远？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">5 * 3 * 2</gadget>
<output>30</output>

<result>30</result>