The distance from Zhengzhou to Beijing is about 690km. Two trains, A and B, depart from the two cities at the same time. They run towards each other and meet each other after 2.3 hours. Car A travels 140 km per hour, how many kilometers per hour does Car B travel? (column equation solution)
郑州到北京的距离约690km，甲乙两列火车同时从两个城市相对开出，相向而行，经过2.3小时相遇．甲车每小时行140km，乙车每小时行多少km？(列方程解答)
<gadget id="calculator">140 * 2.3</gadget>
<output>322</output>

<gadget id="calculator">690 - 322</gadget>
<output>368</output>

<gadget id="calculator">368 / 2.3</gadget>
<output>160</output>

<result>160</result>