Wang Qiang drove from point A at a speed of 60 kilometers per hour, arrived at point B after 4 hours, and returned along the original road. If he is traveling at 80 km/h, how many hours will it take to return to point A?
王强开车以每小时60千米的速度从A地出发，4小时后到达B地，沿原路返回时．如果他以每小时80千米的速度行驶，那么返回A地需要几小时？
<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>