Uncle Wang drives from place A to place B, traveling 50 kilometers per hour, and it takes 3 hours to get there. When he returns, he travels 60 kilometers per hour. How long will it take to return?
王叔叔开车从甲地到乙地，每小时行50千米，要用3小时到达，返回时每小时行60千米，返回要用多长时间？
<gadget id="calculator">3 / 60</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">50 * (1/20)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>