The distance between A and B is 120 kilometers, and a car travels 60 kilometers per hour. How many hours does it take to go from A to B and back to A?
甲、乙两地相距120千米，一辆汽车每小时行驶60千米，从甲地到乙地再回甲地往返一次需要几小时？
<gadget id="calculator">2 / 60</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">120 * (1/30)</gadget>
<output>4</output>

<result>4</result>