A car is full of gas, and when going from A to B, it uses 1/3 of the fuel in the tank, and it uses 1/4 more fuel in the tank when it comes back. What fraction of the oil in the fuel tank was used back and forth?
一辆汽车加满油，从甲地到乙地，去时用了油箱(1/3)的油，回来时比去时多用了油箱(1/4)的油．来回一共用了这个油箱几分之几的油？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>