The world's first Sutong Yangtze River Bridge is located between Nantong City and Changshu City, with a total length of 32.4km. Vehicles A and B drive towards each other at 100km/h and 80km/h respectively. How many hours later will they meet?
世界第一的苏通长江大桥位于南通市和常熟市之间，全长32.4km，甲、乙两车分别以时速100km和80km从大桥两头相向而行，经几小时后相遇？
<gadget id="calculator">100 + 80</gadget>
<output>180</output>

<gadget id="calculator">32.4 / 180</gadget>
<output>0.18</output>

<result>0.18</result>