Xiao Ming rides a bicycle and travels 3.4 kilometers in 0.4 hours. At this speed, how long would it take him to ride a bicycle to a park 5.1 kilometers away?
小明骑自行车，0.4小时行了3.4千米．照这样的速度，他骑自行车到距离5.1千米远的公园去游玩，大约需要多长时间？
<gadget id="calculator">3.4 / 0.4</gadget>
<output>8.5</output>

<gadget id="calculator">5.1 / 8.5</gadget>
<output>0.6</output>

<result>0.6</result>