Xiaoming and Xiaojun set off from places A and B respectively at the same time and head towards each other. If the two move forward at the original speed, they will meet in 5 hours; if both of them are 2 kilometers per hour faster than the original speed, they will meet in 3 hours. What is the distance between A and B in kilometers?
小明和小军分别从甲、乙两地同时出发，相向而行．若两人按原定速度前进，则5小时相遇；若两人各自都比原走速度快2千米/小时，则3小时相遇．甲、乙两地相距多少千米．
<gadget id="calculator">3 * 2 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>