In the morning, Xiao Wang set off from A to B by bicycle. At 12:00 noon, Xiao Li also drove from place A to place B. At 1:30 pm the distance between the two was 18 kilometers, and at 2:30 pm the distance between the two was another 18 kilometers. At 4:00 p.m. Xiao Li arrives at B, and at 6:00 p.m. Xiao Wang arrives at B. What time did Xiao Wang set off in the morning?
早晨，小王骑车从甲地出发去乙地．中午12点，小李开车也从甲地出发前往乙地．下午1点30分时两人之间的距离是18千米，下午2点30分时两人之间的距离又是18千米．下午4点时小李到达乙地，晚上6点时小王到达乙地．小王是早晨多少点出发的．
<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<gadget id="calculator">18 + 18</gadget>
<output>36</output>

<gadget id="calculator">4 * 36</gadget>
<output>144</output>

<gadget id="calculator">144 / 2</gadget>
<output>72</output>

<gadget id="calculator">72 * 4</gadget>
<output>288</output>

<gadget id="calculator">288 / 36</gadget>
<output>8</output>

<gadget id="calculator">18 - 8</gadget>
<output>10</output>

<result>10</result>