A car and a large truck go from point a to point b at the same time, the car returns immediately after arriving at point b, the speed increases by 50%, and it meets the large truck after two hours. When the big truck arrives at point b, the car is exactly at the midpoint between points a and b. How many hours does it take for the car to travel alone?
小轿车和大货车同时从a地到b地，小轿车到达b地后立即返回，速度提升了50%，经两小时与大货车相遇．当大货车到b地时，小轿车正好在a、b两地的中点，问小轿车单独行完全程要多少小时？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>