On the way from the pizzeria to my house, there is a signal light every 450 meters. The color of the light is always changed repeatedly in the order of green for 35 seconds, yellow for 5 seconds, and red for 35 seconds. The boy in the cake shop has been delivering cakes on a motorcycle at a speed of 54 kilometers per hour. He was very lucky, the signal light always turned green the moment he arrived, allowing him to pass smoothly. When he returns on the same road, if he can also catch up with the green light at the moment when it arrives, what is the fastest speed of the motorcycle he is driving in kilometers per hour?
从比萨饼店到我家的路上，每隔450米就有一个信号灯，灯的颜色总是按照绿35秒、黄5秒、红35秒这样的顺序重复地变换着．饼店的小伙子一直是以每小时54千米的速度骑摩托车送饼．他的运气特别好，信号灯总是在他临到的那一瞬间变绿了，使他能够顺利通过．当他原路返回时，如果也能那么巧地在临到的那一瞬间赶上绿灯的话，他驾驶的摩托车的最快速度是每小时多少千米．
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