The expressway from Xixiang to Xi'an is 292 kilometers long. Two cars A and B start from two cities at the same time, drive toward each other, and meet each other after 2 hours. Car A travels an average of 68 kilometers per hour, how many kilometers per hour does Car B travel on average? (solution with equation)
从西乡到西安的高速路长292千米．甲乙两辆汽车同时从两个城市出发，相向而行，经过2小时相遇．甲车平均每小时行68千米，乙车平均每小时行驶多少千米？(用方程解答)
<gadget id="calculator">68 * 2</gadget>
<output>136</output>

<gadget id="calculator">292 - 136</gadget>
<output>156</output>

<gadget id="calculator">156 / 2</gadget>
<output>78</output>

<result>78</result>