Xiaoyue's family drove to a foreign place for a trip. They originally planned to drive 45 kilometers per hour. In fact, due to traffic jams on the expressway, the car only traveled 30 kilometers per hour, so it was 2 hours late. May I ask: How much did Xiaoyue's family actually spend on the road? How many hours?
小悦一家开车去外地旅游，原计划每小时行驶45千米，实际上，由于高速公路堵车，汽车每小时只行驶30千米，这样就晚到了2小时，请问：小悦一家在路上实际花了几个小时？
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / 45</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">(1/30) - (1/45)</gadget>
<output>1/90 = around 0.011111</output>

<gadget id="calculator">2 / (1/90) / 30</gadget>
<output>6</output>

<result>6</result>