A section of road is uphill, flat road, and downhill. The distance ratio of each section is 1:2:3. The time ratio for a person to complete each section is 4:5:6. It is known that his uphill speed is 3 km/h, the total length is 60km, how long did it take this person to complete the journey?
一段路分别是上坡、平路、下坡，各路段的路程比是1：2：3，一个人走完各路段的时间比是4：5：6，已知他上坡的速度是3千米/时，全长60km，这人走完全程用了多少时？
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) / 3 / 4</gadget>
<output>1/72 = around 0.013889</output>

<gadget id="calculator">4 + 5 + 6</gadget>
<output>15</output>

<gadget id="calculator">60 * (1/72) * 15</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>