The railway from Hangzhou to Ningbo is 168 kilometers long. Two trains, A and B, depart from the two cities at the same time. After meeting for 1.5 hours, train A travels an average of 54 kilometers per hour. How many kilometers per hour does train B travel on average?
杭州到宁波的铁路长168千米，甲、乙两列火车分别从两城同时相向开出，经过1.5小时相遇，甲火车平均每小时行驶54千米，乙火车平均每小时行驶多少千米？
<gadget id="calculator">168 / 1.5</gadget>
<output>112</output>

<gadget id="calculator">112 - 54</gadget>
<output>58</output>

<result>58</result>