Xiao Ming and Xiao Hong set off from A to B, Xiao Ming departs at 6:00 am, and Xiao Hong departs at 6:30. It is known that Xiaohong travels 12 meters more per minute than Xiaoming, and both of them arrive at B at 9:00 a.m. Find Xiaohong's average speed.
小明和小红从甲地出发去乙地，上午6点小明出发，6点30分小红出发．已知小红每分钟比小明每分钟多行12米，上午9点两人同时到达乙地，求小红的平均速度．
<gadget id="calculator">180 * 12</gadget>
<output>2_160</output>

<gadget id="calculator">180 - 150</gadget>
<output>30</output>

<gadget id="calculator">2_160 / 30</gadget>
<output>72</output>

<result>72</result>