The children under Mr. Wang choose which mode of travel is more suitable and know how long it will take.
It takes 10 minutes for Mr. Wang's children to choose the mode of self-driving travel. According to relevant public information, what kind of travel mode Mr. Wang's children choose is the topic on page 16 of the fourth grade mathematics textbook, which includes two options: walking and taking the bus. Taking the bus is the fastest way to travel, and the time required is 10 minutes.