Uncle Wang spent 3 hours driving from place A to place B, traveling 50 kilometers per hour, and 60 kilometers per hour when returning. How long did it take to return?
王叔叔开车从甲地到乙地一共用了3小时，每小时行50千米，返回时每小时行60千米，返回时用了多长时间？
<gadget id="calculator">50 * 3</gadget>
<output>150</output>

<gadget id="calculator">150 / 60</gadget>
<output>5/2 = around 2.5</output>

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