Person A and Person B walk toward each other from places A and B which are 360 kilometers apart at the same time, and they meet after 7.2 hours. A's speed is three times that of B's, how many kilometers per hour does B travel? (solution by equation)
甲乙二人同时从相距360千米的甲乙两地相向而行，7.2小时后相遇．甲的速度是乙的3倍，乙每小时行多少千米？(用方程解)
<gadget id="calculator">7.2 * 3</gadget>
<output>21.6</output>

<gadget id="calculator">7.2 + 21.6</gadget>
<output>28.8</output>

<gadget id="calculator">360 / 28.8</gadget>
<output>12.5</output>

<result>12.5</result>