A passenger car and a freight car run in the same direction on the parallel track. The length of the passenger car is 220 meters, and the length of the freight car is 320 meters. The sum of the speed of the passenger car and the freight car is 32 meters per second. Now the passenger car catches up with the freight car from behind. If the time of the two cars crossing is 1 minute, the speed of the two cars can be calculated

A passenger car and a freight car run in the same direction on the parallel track. The length of the passenger car is 220 meters, and the length of the freight car is 320 meters. The sum of the speed of the passenger car and the freight car is 32 meters per second. Now the passenger car catches up with the freight car from behind. If the time of the two cars crossing is 1 minute, the speed of the two cars can be calculated

If the time for two cars to cross is one minute, that is to say, the bus runs 220 + 320 = 540 meters more than the truck in one minute
So the speed of the bus is 9 meters per second faster than that of the truck
And because the speed sum of passenger cars and freight cars is 32 meters per second
Therefore, the speed of passenger cars is 20.5 meters per second, and that of freight cars is 11.5 meters per second

A and B cars leave 324km apart from each other at the same time. After three hours, they meet on the way. The speed of car a is 45 times that of car B. how many kilometers does car a travel per hour?

324 ／ 3 ／ (1 + 45) × 45, = 108 ／ 95 × 45, = 108 × 59 × 45, = 48 (km); answer: car a travels 48 km per hour

The distance between a and B is 546 kilometers. A and B cars leave each other and meet each other in three hours. It is known that a's speed is three times that of B's. how many kilometers does a car travel per hour?

If the speed of car a is 3x and the speed of car B is x, there are:
（3X+X）×3=546
12X=546
3X=546÷4=136.5
A: car a travels 136.5 kilometers per hour