A truck transports apples from point A to point B. It travels 40 kilometers per hour on the way there, takes 6 hours to arrive, and travels 60 kilometers per hour on the way back. How many hours does it take to get back to point A?
一辆货车从A地把苹果运到B地，去的时候每小时行40千米，用了6小时到达，回来的时候每小时行60千米，需要几小时才能回到A地？
<gadget id="calculator">6 / 60</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">40 * (1/10)</gadget>
<output>4</output>

<result>4</result>