88. Transportation Puzzle. Twelve soldiers need to get to a point 20 km away from their location as quickly as possible. To do this, they stopped a small car.

- I drive at a speed of 20 km/h, - the driver said, - but I can only take four of you at a time. How fast do you walk?
- Each of us walks 4 km/h, - one of the soldiers replied.
- Excellent, - the driver exclaimed, - then I will drive forward with four of you, take them part of the way, then return and pick up another four, take them as well, and return for the rest. All you need to do is walk whenever you are not in the car, I will take care of the rest.

The soldiers set off at exactly noon. When will they arrive at their destination[^5]
88. The driver must transport four soldiers 12 km and drop them off 8 km from the destination. Then he must return 8 km and pick up another four soldiers (out of eight) who will be there by then, transport them 12 km and drop them off 4 km from the destination. Returning 8 km to pick up the remaining soldiers, who by then will have walked 8 km from the starting point, he must transport them 12 km to the end. All soldiers will arrive at the destination simultaneously, and the car will have traveled 52 km in \(2 \frac{3}{5}\) hours. Therefore, the soldiers will arrive at the destination in 2 hours and 36 minutes.