The speed ratio between Xiaogang and Xiaoqiang is 15:13. If Xiaogang and Xiaoqiang set off from places A and B at the same time, they go towards each other and meet each other half an hour later; if they go in the same direction, then Xiaoqiang How many hours does it take just to catch up with Xiaoqiang?
小刚，小强两人骑车的速度之比是15：13，如果小刚，小强分别由甲、乙两地同时出发，相向而行，半小时后相遇；如果他们同向而行，那么小刚追上小强需要多少小时．
<gadget id="calculator">15 + 13</gadget>
<output>28</output>

<gadget id="calculator">28 * 0.5</gadget>
<output>14</output>

<gadget id="calculator">15 - 13</gadget>
<output>2</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<result>7</result>