The ostrich is the largest bird in the world. Its running speed can reach 72km/hour, which is 12km less than twice that of the hare. How many kilometers per hour can the hare's running speed reach?
鸵鸟是世界上最大的鸟，它奔跑的速度可达72km/时，比野兔的2倍少12km，野兔的奔跑速度可达每小时多少千米？
<gadget id="calculator">72 + 12</gadget>
<output>84</output>

<gadget id="calculator">84 / 2</gadget>
<output>42</output>

<result>42</result>