Uncle Wang drove from place A to place B to deliver goods. It took 12 hours to go there, driving 85 kilometers per hour. When he returned, he had a task, so he returned to place A 2 hours earlier. What was the speed when he returned?
王叔叔开车从甲地到乙地送货，去时用了12小时，每小时行驶85千米，返回时由于有任务，所以提前2小时回到了甲地，返回时的速度是多少？
<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">85 / 10</gadget>
<output>17/2 = around 8.5</output>

<gadget id="calculator">12 * (17/2)</gadget>
<output>102</output>

<result>102</result>