Cars A and B start from cities A and B, which are 240 kilometers apart, and drive towards each other at the same time. It is known that it takes 3 hours for car A to travel from city A to city B, and it takes 5 hours for car B to travel from city B to city A. How many hours did they meet after the car departed?
甲、乙两车分别从相距240千米的A、B两城同时出发相向而行，已知甲车从A城到B城需3小时，乙车从B城到A城需5小时，两车出发后几小时相遇？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) + (1/5)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">1 / (8/15)</gadget>
<output>15/8 = around 1.875</output>

<result>15/8 = around 1.875</result>