A person rides a bicycle from a small town to the county seat, departs at 8 o'clock, and plans to arrive at 9 o'clock. After riding for a while, the bicycle breaks down. He gets off the bicycle and repairs it on the spot for 10 minutes. The repair location is 2 kilometers away from the midpoint. , In order to arrive at the county seat on time, he increased his speed (1/4), but he still arrived at the county seat 2 minutes later than the scheduled time. How many kilometers did the cyclist travel per hour?
某人骑自行车从小镇到县城，8点出发，计划9点到达，骑了一段路后，自行车出了故障，下车就地修车10分钟，修车地点距中点还差2千米，他为了按时到县城，车速提高了(1/4)，结果还是比预定时间晚2分钟到达县城，骑车人原来每小时行多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">8 / 60</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">5 * (2/15)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 / (1/6)</gadget>
<output>12</output>

<result>12</result>