A large truck and a car drive from place A to place B at the same time, and the car returns immediately after arriving at place B, and the speed of returning increases by 50%. Two hours after departure, the car and the truck meet for the first time. When the big truck arrives at point B, the car just arrives at the midpoint between places A and B. How long does it take for a car to go back and forth between places A and B?
一辆大货车与一辆小轿车同时从甲地开往乙地，小轿车到达乙地后立即返回，返回时速度提高50%．已出发2小时后，小轿车与货车第一次相遇，当大货车到达乙地时，小轿车刚好走到甲、乙两地的中点．小轿车在甲、乙两地往返一次需要多少时间？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 / (5/9)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) * (5/9)</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">(9/5) + (6/5)</gadget>
<output>3</output>

<result>3</result>