A passenger car drove from place A to place B, and traveled 400 meters in the first 5 hours, which happened to be the whole journey (2/5). At this speed, how many hours will it take to get to B?
一辆客车从甲地开往乙地，前5小时行了400米，正好行了全程的(2/5)．照这样速度，到乙地还要行多少小时？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">400 / (2/5)</gadget>
<output>1_000</output>

<gadget id="calculator">400 / 5</gadget>
<output>80</output>

<gadget id="calculator">1_000 / 80</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>