It takes 5 hours for a train to go from city A to city B, traveling 120km per hour. When returning to the original road, driving 125km per hour, how many hours did it take to return?
一列火车从A城开往B城一共用5小时，每小时行驶120km．原路返回时，每小时行驶125km，返回时用了多少小时？
<gadget id="calculator">5 / 125</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">120 * (1/25)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>