Required Mathematical Intelligence

Chapter 45 Fare
A coachman is pulling two passengers, A and B, who are going in the same direction.After walking 4 miles, A got off the car.Then, B walked another 4 miles before getting off the bus.The total fare is 12 copper coins.Q: How much should Party A and Party B share the fare?
[Answer: We can think of it this way, the fare for the entire distance is 12 copper coins, A and B take a total of 4 miles, the payable fare is 6 copper coins, and the fare payable by A is naturally 3 copper coins.B pays 4 copper coins for the fare during the first 3 miles, and takes the car by himself during the last 4 miles. Naturally, he pays 6 copper coins by himself, which is 9 copper coins in total.This distribution is reasonable.List the uniform formula:

甲应付的车费——12×[4÷（4 4）]÷2=3
乙应付的车费——（12×4÷（4 4）÷2） 12×4÷（4 4）=9]
(End of this chapter)