logical problem (how long did you walk?) My wife is very kind, she always picks me up at work by car and drives me home. Today, I finished at work 30 minutes earlier! So I decided to walk home... on the way I met my wife. She was on her way to pick me up, so I sat in the car and she drove me home. Today I was home 10 minutes earlier than usual.
How long did I walk?
Does anyone know how to solve it using maths and not just guessing? :)

Hint:  She drove 5 minutes less in each direction than usual.
