Two cars, A and B, are traveling toward each other at a distance of 380 kilometers. Car A travels 50 kilometers per hour. Car B starts to leave after driving for 1 hour. After 3 hours, when the two cars meet, how many kilometers does car B travel per hour? ?
甲乙两车在相距380千米的两地相向而行，甲车每小时行50千米，甲车行1小时后乙车开始出发，经过3小时两车相遇，乙车每小时行多少千米？
<gadget id="calculator">380 - 50</gadget>
<output>330</output>

<gadget id="calculator">330 / 3</gadget>
<output>110</output>

<gadget id="calculator">110 - 50</gadget>
<output>60</output>

<result>60</result>