Winnie-the-Pooh and Piglet set out to visit one another. They leave their houses at the same time and walk along the same road.
While Piglet is absorbed in counting the birds overhead Winnie-the-Pooh is composing a new “hum,” so they pass one another without noticing.
One minute after the meeting, Winnie-the-Pooh is at Piglet’s house, and 4 minutes after the meeting Piglet is at Winnie-the-Pooh’s.

How long has each of them walked?

Source: Russian science magazine Kvant