After Zhengzhou BRT opened, in response to the city government's call for "green travel", Xiao Wang, who lives in the western suburbs, changed from driving to work by bus. It is known that Xiao Wang’s home is 18 kilometers away from his work place, and the average distance he travels per hour by public transport is 9 kilometers more than twice the average distance traveled per hour by his own car. He starts from home To arrive at the work place, the time taken by bus is 3/7 of the time taken by self-driving car. How many kilometers per hour does Xiao Wang drive to work by self-drive on average?
郑州BRT开通后，为响应市政府"绿色出行"的号召，家住西郊的小王上班由自驾车改为乘坐公交车．已知小王家距上班的地点18千米，他用乘公交的方式平均每小时行驶的路程比他用自己驾车的方式平均每小时行驶的路程的2倍还多9千米，他从家出发到达上班地点，乘公交方式所用时间是自驾车方式所用时间的(3/7)，小王用自驾车方式上班平均每小时行驶多少千米？
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">(7/3) - 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9 / (1/3)</gadget>
<output>27</output>

<result>27</result>