Two cars drive towards each other at the same time from two places 578km apart. The two cars meet after 3.4 hours. It is known that car A travels 80 km per hour, how many kilometers per hour does car B travel? (solved with equations)
两辆车从相距578km的两地同时相向开出．两车3.4小时后相遇，已知甲车每小时行80km，乙车每小时行多少千米？(用方程解决)
<gadget id="calculator">80 * 3.4</gadget>
<output>272</output>

<gadget id="calculator">578 - 272</gadget>
<output>306</output>

<gadget id="calculator">306 / 3.4</gadget>
<output>90</output>

<result>90</result>