Uncle Wang drove vegetables into the city in the morning. It took 3 hours to drive 60 kilometers per hour, and only 2 hours to return. What was the speed of Uncle Wang when he returned?
王叔叔上午开车送蔬菜进城，去时每小时行60千米，用了3小时，返回时只用了2小时．王叔叔返回时的速度是多少？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">60 * (3/2)</gadget>
<output>90</output>

<result>90</result>