The car traveled the whole distance (2/5) in 5 hours, and there is still 100 kilometers away from the midpoint. How many kilometers does the car travel per hour?
汽车5小时行驶了全程的(2/5)，距离中点还有100千米，这辆汽车每小时行驶多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 / (1/10)</gadget>
<output>1_000</output>

<gadget id="calculator">(2/5) / 5</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">1_000 * (2/25)</gadget>
<output>80</output>

<result>80</result>