Xiao Li travels 4 kilometers per hour from the village to the county seat, and when he arrives at the scheduled arrival time, he is still 1.5 kilometers away from the county seat. If Xiao Li walks 5.5 kilometers per hour, he will walk another 4.5 kilometers when he arrives at the scheduled arrival time. How many kilometers is the village from the county seat?
小李由乡里到县城办事，每小时行4千米，到预定到达时间时，离县城还有1.5千米．如果小李每小时走5.5千米，到预定到达时间时，又会多走4.5千米．乡里距县城多少千米．
<gadget id="calculator">1.5 + 4.5</gadget>
<output>6</output>

<gadget id="calculator">5.5 - 4</gadget>
<output>1.5</output>

<gadget id="calculator">6 / 1.5</gadget>
<output>4</output>

<gadget id="calculator">5.5 * 4</gadget>
<output>22</output>

<gadget id="calculator">22 - 4.5</gadget>
<output>17.5</output>

<result>17.5</result>