Plant trees at equal distances on a road. A and B start from a tree at both ends of the road at the same time. After 5 minutes, when A walks to the 22nd tree counted from his side, B has just walked to the tree from B. For the 10th tree counted over there, it is known that B walks 36 meters per minute. Question: How many meters does A walk per minute?
在一条路上按相等的距离植树，甲乙二人同时从路的两端的某地一棵树出发，5分钟后当甲走到从自己这边数的第22棵树时，乙刚走到从乙那边数的第10棵树，已知乙每分钟走36米．问：甲每分钟走多少米？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">22 - 1</gadget>
<output>21</output>

<gadget id="calculator">21 / 5</gadget>
<output>21/5 = around 4.2</output>

<gadget id="calculator">36 * (5/9) * (21/5)</gadget>
<output>84</output>

<result>84</result>