At the same time, the bus and freight car drive in the opposite direction from the midpoint of a and B towns. Three hours later, the bus arrives at a town, and the freight car is 35 kilometers away from B town It is known that the speed of freight cars is 3 / 4 of that of passenger cars. How many kilometers are there between a and B towns

At the same time, the bus and freight car drive in the opposite direction from the midpoint of a and B towns. Three hours later, the bus arrives at a town, and the freight car is 35 kilometers away from B town It is known that the speed of freight cars is 3 / 4 of that of passenger cars. How many kilometers are there between a and B towns

35 ÷ (1-3 / 4) × 2 = 280 km

After 3 hours, the bus arrives at city a, and the truck is 30 kilometers away from city B, which has been completed
How many kilometers are there between city a and city B?

Suppose the speed of a passenger car is x, then the speed of a freight car is 3x / 4
3X=3X/4+30
12X-3X=120
9X=120
X=3/40
3 / 40 * 3 = 40 km

Three hours later, the bus arrives at a town, and the train is 30 kilometers away from B town
The speed ratio of the train to the bus is 4:3. How many kilometers are there between the two towns

The speed ratio of train to bus is 4:3
So when a arrives, B goes from the middle point to 3 / 4 of B
The distance from midpoint to B is 30 / (1-3 / 4) = 120 km
120 * 2 = 240 km