The car goes up the mountain at a speed of 40 km/h, and it takes 6 hours to reach the top of the mountain. The return speed of the original road is 48 km/h, how many hours did it take for the car to return?
汽车上山速度是40千米/时，用了6小时到山顶．原路返回速度是48千米/时，这辆汽车返回时用了多少小时？
<gadget id="calculator">6 / 48</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">40 * (1/8)</gadget>
<output>5</output>

<result>5</result>