A car from a to B, the front section is the ordinary highway, the rest of the road is the highway. It is known that the distance of the ordinary highway is half the distance of the highway, the speed of the car on the ordinary highway is 60 km / h, the speed on the highway is 100 km / h, the car from a to B has driven for 2.2 hours, how many kilometers is the distance between ab?

A car from a to B, the front section is the ordinary highway, the rest of the road is the highway. It is known that the distance of the ordinary highway is half the distance of the highway, the speed of the car on the ordinary highway is 60 km / h, the speed on the highway is 100 km / h, the car from a to B has driven for 2.2 hours, how many kilometers is the distance between ab?

If the distance of ordinary highway is x and that of expressway is 2x, then the time of ordinary section is X60 and that of expressway section is 2x100. According to the meaning of the question, X60 + 2x100 = 2.2, the solution is x = 60, so the distance between AB is x + 2x = 180 km. Answer: the distance between AB is 180 km

The first third section of a car from a to B is an ordinary highway, and the other sections are expressways. It is known that the speed of a car on the ordinary highway is 60
Km / h, the speed of driving on the high road is 100 km / h, and the total time of driving from a to B is 2.2 hours. How many kilometers are the ordinary road and expressway respectively? (the hidden condition of this question is that the length of the ordinary road and expressway is 1:2. If the length of the ordinary road is x km, the expressway is 2x km, and then the equation is listed according to the meaning of the question.)

Distance ratio = speed ratio x time ratio
Let the time ratio be X
Solving the equation by the formulation
or
Time ratio = distance ratio / speed ratio
＝（1：2）/（60：100）
＝5：6
2 x (5 / 11) = 1 hour for ordinary highway
It took 2.2-1 = 1.2 hours on the highway
So the average highway is 60 kilometers long
The highway is 120 kilometers long
This method is relatively simple. You have to use the traditional method, but I don't think it's necessary

The distance between city a and city B is 360 km. The speed of a car is 90 km / h. It takes three hours for a car to reach city B. how many kilometers per hour does it increase?

Speed increase = 360 △ 3-90 = 30 km / h

1. How many kilometers does the marathon run? 2. How many kilometers can a car run on the highway?

42.195
The maximum speed of expressway should not exceed 120 km / h