Xiao Zhang is on the train, with his back facing the direction of the train, a high-speed passenger car comes across from Xiao Zhang, and it takes 9 seconds for the high-speed passenger car to pass by Xiao Zhang from the front to the rear. If the speed of the high-speed bus is 120 km/h, and the speed of the train that Xiao Zhang takes is 60 km/h, what is the length of the high-speed bus?
小张坐列车上，背朝列车前进方向，从小张对面开来一列高速客车，高速客车从车头至车尾从小张旁边驶过时用了9秒钟．若高速客车的车速为120千米/小时，小张乘坐的列车速度是60千米/小时，那么高速客车的长度是多少？
<gadget id="calculator">50 / 3</gadget>
<output>50/3 = around 16.666667</output>

<gadget id="calculator">(50/3) * 9</gadget>
<output>150</output>

<result>150</result>