car drives from place A to place B, travels 50 kilometers per hour, and arrives in (4/5) hours. If the speed is reduced by 20%, how many hours can it be reached?
一辆汽车从甲地开往乙地，每小时行50千米，(4/5)小时到达，如果把速度降低20%，那么几个小时可以到达？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">50 * (4/5)</gadget>
<output>40</output>

<gadget id="calculator">(4/5) / 40</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">50 * (1/50)</gadget>
<output>1</output>

<result>1</result>