## 12. Punctual Wife

Every Saturday between 15 and 16, I play tennis with my friend Philippe. My wife arrives to pick me up in the car precisely at 16:10. One day, Philippe fell ill. Unaware of this, I set out for tennis as usual. However, at 15:05, realizing that Philippe wasn't coming, I gathered my things and started walking home. On the way, I met my wife, who was driving to pick me up. I got into the car, and we arrived home 10 minutes earlier than usual.

This might not seem very interesting, but could you determine from this story the ratio between my walking speed and the speed at which my wife drives?
12. On the day when Philip fell ill, my wife drove the car for 10 minutes less than usual; that means she drove 5 minutes less in each direction. Therefore, 
I met her at 4:05 PM, instead of 4:10 PM as usual. But then I walked for 60 minutes to cover the distance my wife drives in 5 minutes. Thus, I walk 12 times slower than my wife drives.