It takes 10 hours for a passenger car to travel from A to B, and 15 hours for a truck to travel from B to A. The passenger car leaves only 5 hours after the truck leaves. When the two vehicles meet, how long does the passenger car drive?
客车从甲地到乙地要10小时，货车从乙地到甲地要15小时，货车开出5小时后客车才出发，两车相遇时客车行驶了几小时？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">5 * (1/15)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) + (1/15)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/3) / (1/6)</gadget>
<output>4</output>

<result>4</result>