A car drives from A to B at a speed of 60 kilometers per hour, and it takes 4 hours to get there; if it travels 80 kilometers per hour when returning, how many hours can it be reached?
一辆汽车以每小时60千米的速度从甲地开往乙地，4小时可以到达；如果返回时每小时行驶80千米，几小时可以到达？
<gadget id="calculator">4 / 80</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">60 * (1/20)</gadget>
<output>3</output>

<result>3</result>