person rides a bicycle from Jiacun to the county town for a meeting. He arrives on time at 15km per hour. After traveling the whole distance (8/9), he can only walk because of a bicycle breakdown. The walking speed is 5km per hour, and he arrives 20 minutes late. Minutes, how many kilometers is the distance from Jiacun to the county seat?
某人从甲村骑自行车到县城开会，每小时行15km就能按时到达，行了全程的(8/9)后，因自行车发生故障，只能步行，步行速度是每小时5km，结果迟到了20分钟，求从甲村到县城的距离是多少千米？
<gadget id="calculator">20 / 60</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(8/9) * (1/15)</gadget>
<output>8/135 = around 0.059259</output>

<gadget id="calculator">(8/9) * (1/5)</gadget>
<output>8/45 = around 0.177778</output>

<gadget id="calculator">(8/135) - (8/45) - (1/15)</gadget>
<output>-5/27 = around -0.185185</output>

<gadget id="calculator">(1/5) + (-5/27)</gadget>
<output>2/135 = around 0.014815</output>

<gadget id="calculator">(1/3) / (2/135)</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>