It takes 4 hours for one car and 6 hours for the other car to travel between places A and B, which are 180 kilometers apart. How many hours will it take for the two cars to start from places A and B at the same time?
行相距180千米的甲乙两地，一辆车要4小时，另一辆车要6小时，两车从甲乙两地同时出发多少小时两车共行了全长的一半？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) + (1/6)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(1/2) / (5/12)</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>