Manager Li's driver arrived at Manager Li's house at 7:30 every morning to pick him up and go to the company. One day, Manager Li set off from home at 7:00 and walked to the company. On the way, he encountered a car that picked him up on time from the company, and then took the car to the company. He arrived 5 minutes earlier than usual. Then how many times the speed of Manager Li's driving speed is the walking speed. (assuming that the vehicle speed and walking speed remain unchanged, the time of turning around and getting on and off the car is ignored)
李经理的司机每天早上7点30分到达李经理家接他去公司．有一天李经理7点从家里出发步行去公司，路上遇到从公司按时接他的车，再乘车去公司，结果比平常早到5分钟．则李经理乘车的速度是步行速度的多少倍．(假设车速、步行速度保持不变，汽车掉头与上下车时间忽略不计)
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">30 - (5/2)</gadget>
<output>55/2 = around 27.5</output>

<gadget id="calculator">(55/2) / (5/2)</gadget>
<output>11</output>

<result>11</result>