Cars A and B travel towards each other from places a and b which are 250 kilometers apart. Car A travels 60 kilometers per hour, and car B travels 65 kilometers per hour. After they arrive at places a and b, they return immediately. How many hours later do they meet for the second time on the way back?
甲、乙两车从相距250千米的a、b两地相向而行，甲车每小时行60千米，乙车每小时行65千米．它们到达a、b两地之后立即返回，几小时后它们在返回途中第二次相遇？
<gadget id="calculator">60 + 65</gadget>
<output>125</output>

<gadget id="calculator">3 / 125</gadget>
<output>3/125 = around 0.024</output>

<gadget id="calculator">250 * (3/125)</gadget>
<output>6</output>

<result>6</result>