Two cars a and B leave each other at the same time. They meet in three hours. When they meet, car B runs 712 kilometers in the whole journey. Car a runs 120 kilometers. How many kilometers does car B travel per hour?

Two cars a and B leave each other at the same time. They meet in three hours. When they meet, car B runs 712 kilometers in the whole journey. Car a runs 120 kilometers. How many kilometers does car B travel per hour?

120 (1-712) × 712 (3), = 120 × 125 × 712 (3), = 24 × 7 (3), = 56 (km); answer: car B travels 56 km per hour

The two trains of a and B leave each other from ab at the same time and meet at the place 30 kilometers away from a station. The two trains are still driving at the original speed, and each train arrives at the starting point of the other
We meet again 30 kilometers away from B. how many kilometers are there between a and B

30 × 3-30 = 60 km
When they first met, the sum of the distance between the two vehicles was 1 A, B distance, and a distance of 30 km
At the second meeting, the sum of the distances between the two vehicles was three distances between a and B, so a traveled 30 × 3 = 90 km
I also know that the distance between a and B is more than 30 kilometers
Therefore, the distance between a and B is 30 × 3-30 = 60 km