Wang Hua's family went for an outing on Sunday. It took 3 hours to drive 60 kilometers per hour, and 2 hours to return. How many kilometers per hour did you travel on average when you returned?
星期天王华一家去郊游，去时每小时行驶60千米，用了3小时，返回用了2小时．返回时平均每小时行多少千米？
<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>