The passenger and freight cars leave from a and B at the same time and meet at the point 12km away from the midpoint. It is known that the ratio of passenger car travel to freight car travel is 9:8. How many km is the distance between a and B?

The passenger and freight cars leave from a and B at the same time and meet at the point 12km away from the midpoint. It is known that the ratio of passenger car travel to freight car travel is 9:8. How many km is the distance between a and B?

12 × 2 = 24 (km) 24 △ 917-817 = 24 △ 117 = 408 (km) a: the distance between a and B is 408 km

The two passenger and freight cars run from a and B to each other respectively. The freight car takes 3 / 10 of the whole journey first before the passenger car leaves from A. when they meet, the freight car runs less than the passenger car
30 km. It is known that the ratio of bus speed to truck speed is 5:3. How many km is the distance between a and B?

30÷【1-（1-3/10）×5/（5+3）×2】
=30÷【1-7/16×2】
=30÷1/8
=240 km

A passenger car and a freight car start from a and B at the same time and run in opposite directions. When they meet, the passenger car travels 80 kilometers more than the freight car. It is known that the distance the passenger car has traveled is the distance the freight car has traveled
140% of the distance. How many kilometers are there between a and B?

Truck 80 (140% - 100%) = 200 km
The distance between the two places is 200x2 + 80 = 480km
If you don't understand this question, you can ask,

It takes six hours for a bus to go from place a to place B, and eight hours for a freight car to go from place B to place A. when two cars run from two places at the same time, the bus runs 90 kilometers more than the freight car when they meet,
How many kilometers did the two cars travel when they met?

Time ratio: Bus: Truck = 6:8 = 3:4
Speed ratio: Bus: Truck = 4:3
Each: 90 △ 4-3 = 90 (km)
When meeting: 90x4 = 360 (km)
When meeting: 90x3 = 270 (km)