distance is divided into two sections, uphill and downhill, and the ratio of the lengths of these two sections is 4:3. It is known that Archie walks 3 kilometers per hour when going uphill and 4.5 kilometers per hour when going downhill. If Archie took half an hour to complete the journey. Question: How many kilometers is this distance?
一段路程分为上坡和下坡两段，这两段的长度之比是4：3．已知阿奇在上坡时每小时走3千米，下坡时每小时走4.5千米．如果阿奇走完全程用了半小时．请问：这段路程一共有多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 4.5</gadget>
<output>2.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 4.5</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 + 0.75</gadget>
<output>2.25</output>

<gadget id="calculator">2.25 / 2.25</gadget>
<output>1</output>

<gadget id="calculator">1 * 0.75</gadget>
<output>0.75</output>

<gadget id="calculator">1 + 0.75</gadget>
<output>1.75</output>

<result>1.75</result>