Cars A and B leave at the same time from two places 600 kilometers apart and meet each other 4 hours later. Car A travels 80 kilometers per hour, how many kilometers per hour does Car B travel?
甲、乙两车从相距600千米的两地同时开出，4小时后相遇．甲车每小时行80千米，乙车每小时行多少千米？
<gadget id="calculator">600 / 4</gadget>
<output>150</output>

<gadget id="calculator">150 - 80</gadget>
<output>70</output>

<result>70</result>