Two trains, A and B, depart from A and B, which are 456km apart, at the same time. Train A runs at 85km/h and meets after 2.4h. How many kilometers does car B travel per hour? (column equation solution)
甲、乙两列火车分别从相距456km的A、B两站同时相向开出，甲车85km/h，经过2.4h相遇．求乙车每小时行多少千米？(列方程解决)
<gadget id="calculator">85 * 2.4</gadget>
<output>204</output>

<gadget id="calculator">456 - 204</gadget>
<output>252</output>

<gadget id="calculator">252 / 2.4</gadget>
<output>105</output>

<result>105</result>