Cars A and B drive oppositely from two places 287.5 kilometers apart at the same time, and meet after 2.5 hours. Car A travels 47 kilometers per hour, how many kilometers per hour does Car B travel?
甲、乙两辆汽车同时从相距287.5千米的两地相对开出，经过2.5小时相遇．甲汽车每小时行47千米，乙汽车每小时行多少千米？
<gadget id="calculator">47 * 2.5</gadget>
<output>117.5</output>

<gadget id="calculator">287.5 - 117.5</gadget>
<output>170</output>

<gadget id="calculator">170 / 2.5</gadget>
<output>68</output>

<result>68</result>