Party A and Party B walk from ab at the same time. When Party A walks at the midpoint of two places, Party B still has 1 / 3 of the distance from the midpoint of the whole journey. What is the speed ratio of Party A and Party B?

Party A and Party B walk from ab at the same time. When Party A walks at the midpoint of two places, Party B still has 1 / 3 of the distance from the midpoint of the whole journey. What is the speed ratio of Party A and Party B?

3:2
It can be understood that a completes the whole journey, B only completes 2 / 3

The two trains leave from a and B at the same time and meet at 48km from the midpoint 4 hours later. It is known that the local train is 37 times the speed of the express train. What are the speeds of the express train and the local train? How many kilometers are there between a and B?

Speed of express train: (48 × 2 △ 4) / (1 − 37) = 24 △ 47 = 42 (km) speed of local train: 42 × 37 = 18 (km) distance between a and B: (42 + 18) × 4 = 60 × 4 = 240 (km) answer: speed of express train is 42 km per hour, speed of local train is 18 km per hour, distance between a and B is 240 km

The two trains leave from a and B at the same time, and they meet at 72km away from the destination in three hours. The known speed of the local train is 5 / 7 of that of the express train. How many kilometers are there between a and B?
No equations, just arithmetic

72 times 2 divided by 4 equals 36 km, fast train: 36 divided by (1 minus 5 / 7) equals 126 km / h, slow train: 126 times 5 / 7 equals 90 km / h, (126 & # 10133; 90)