Two trains a and b depart from places A and B, which are 137.4 kilometers apart, and meet at a certain station 1.2 hours later. It is known that train a travels 60.2 kilometers per hour, how many kilometers does train b travel per hour? (solution by equation)
a、b两列火车从相距137.4千米的甲乙两地相对开出，1.2小时后在某站相遇，已知a车每小时行60.2千米，b车每小时行多少千米？(用方程解)
<gadget id="calculator">137.4 / 1.2</gadget>
<output>114.5</output>

<gadget id="calculator">114.5 - 60.2</gadget>
<output>54.3</output>

<result>54.3</result>