Taxis in a city have different charging standards due to different models: the starting price of A-type taxis is 10 yuan, and the price is 1.2 yuan per thousand meters after 3km, The starting price of type B car is 8 yuan, and the price is 1.4 yuan per thousand meters after 3km (1) If you need to take a taxi to 20km, which type of taxi should you take from the perspective of cost saving? (A: type A costs 30.4 yuan, type B costs 31.8 yuan.) (2) Please calculate how many kilometers you take a taxi, and the cost of the two models is equal? (answer: 13 kilometers.) (3) If you take a type A or B taxi x (x > 3) km Guess: when x is in what range, it costs less to take type a taxi; when x is in what range, it costs less to take type B taxi? Note: (1) and (2) are to provide known conditions,

Taxis in a city have different charging standards due to different models: the starting price of A-type taxis is 10 yuan, and the price is 1.2 yuan per thousand meters after 3km, The starting price of type B car is 8 yuan, and the price is 1.4 yuan per thousand meters after 3km (1) If you need to take a taxi to 20km, which type of taxi should you take from the perspective of cost saving? (A: type A costs 30.4 yuan, type B costs 31.8 yuan.) (2) Please calculate how many kilometers you take a taxi, and the cost of the two models is equal? (answer: 13 kilometers.) (3) If you take a type A or B taxi x (x > 3) km Guess: when x is in what range, it costs less to take type a taxi; when x is in what range, it costs less to take type B taxi? Note: (1) and (2) are to provide known conditions,

Car a fare 10 + 1.2 (10-3)
Bus B fare 8 + 1.4 (x-3)
When equal, 10 + 1.2 (x-3) = 8 + 1.4 (x-3)
By solving this equation, we can get that the fare of two cars is equal when x = 13 km
When x is less than 13, for example, x = 10 A, car fare 10 + 1.2 (10-3) = 18.4 yuan
B car fare 8 + 1.4 (x-3) = 17.8 yuan, B car fare less
It can be seen that when x > 13, the cost of taking type a taxi is less; when x < 13, the cost of taking type B taxi is less;

China's taxi charging standards vary from place to place, Chengdu City is: the starting price is 5 yuan, 3 km after the price is 1.4 yuan per kilometer; write the taxi x (x > 3 and x)
What is the relationship between Y and X? If someone takes a 10 km taxi, how much does he have to pay?

When x ≥ 3, y = 5 + 1.4 (x-3), and when x = 10, y = 15.8

The charging standard of Changzhou taxis is 9 yuan for the starting price [within 3 km, including 3 km], and 1 yuan for the fuel charge. After that, every taxi will be charged
More than 1 kilometer [less than 1 kilometer calculated as 1 kilometer] plus 1.6 yuan
How much do you have to pay for 8 kilometers?

9 + 1 + 1.6 * 5 = 19 yuan