Uncle Wang drives from A to B at a speed of 40 km/h and arrives at 1:00 pm; traveling at a speed of 60 km/h and arrives at 11:00 am. If Uncle Wang hopes to arrive at B at 12:00 noon, what is the driving speed in kilometers per hour?
王叔叔开车从甲地到乙地，以40千米/时的速度行进，下午1点到；以60千米/时的速度行进，上午11点到．如果王叔叔希望中午12点到达乙地，那么行驶速度是多少千米/时．
<gadget id="calculator">13 - 11</gadget>
<output>2</output>

<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">60 * (1/10)</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">2 / 20 / 5</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">40 * 60 * (1/50)</gadget>
<output>48</output>

<result>48</result>