The film crew has a day's journey from city A to city B. It is planned to walk as much in the morning and afternoon, and have lunch from city C. Due to traffic jam, it will arrive in town D at noon.

I strongly suggest that you look at the pictures while reading my answers.

first, make clear the order of place names, namely A D C E B,

and then analyze the conditions one by one

1. Walk as much as in the morning and afternoon, indicating that C is the midpoint of AB

2. Only one-third of the original plan has been made to D, and the original plan is half of the whole journey, so A to D is 1/6 of the whole journey

3. Then walk from C city. And c is the midpoint, that is, CB is 1/2 of AB, and E to B is 1/6 of AB. < P > 4. Thus, D to E is 1-1/6-1/6=2/3

5 of the whole journey, and what is 2/3 of the whole journey? Look at "The car has driven 4 kilometers again", that is, 4 kilometers.