1. Trucks and buses travel from east to west at the same time. Trucks travel 48 kilometers per hour and buses travel 42 kilometers per hour. The two cars met at a distance of18km from the midpoint. How many kilometers is the distance between east and west?

2. Party A and Party B ride bicycles in opposite directions from two places at the same time, with Party A riding 20km per hour and Party B riding18km per hour. When they met, there were still 3 kilometers from the midpoint of the whole journey. How many kilometers is the journey?

3. Two cars, A and B, leave from two cities at the same time. Car A is 60 kilometers per hour, and car B is 56 kilometers per hour. The two cars meet at a distance of 16 km. How many kilometers are the two cities apart?

The express train and the local train leave from east and west at the same time. It is understood that the express train runs 40 kilometers per hour. Three hours later, the express train has passed the midpoint of 25 kilometers. At this time, it is 7 kilometers away from the local train. How many kilometers does the local train travel per hour?

Exercise 2:

1. The circular runway is 400 meters long. Xiaoming runs 300 meters per minute and Xiaohong runs 250 meters per minute. Two people set out for the same place and the same direction at the same time. How long did it take Xiao Ming to catch up with Xiao Hong for the first time?

Bright primary school has a 200-meter-long circular runway. Xiaoming and Xiaohong started from the starting line at the same time. Xiaoming runs 6 meters per second and Xiaohong runs 4 meters per second. How many meters did Xiaoming run when he first caught up with Xiaohong?

Party A and Party B run along the track of the sports ground. Party A runs 290 meters per minute and Party B runs 270 meters per minute. This runway is 400 meters long. If two people run in the same direction from the starting line at the same time, how long does it take for A to catch up with B for the first time?

4. Party A and Party B compete around a circular square with a perimeter of1000m. It is known that Party A walks 125m per minute, and Party B's speed is twice that of Party A. Now Party A is 250m behind Party B, how many minutes does it take for Party B to catch up with Party A?

Exercise 3:

1, Party A and Party B respectively drive eastward from two places 24 kilometers apart. Party A rides bike every hour13km, and Party B walks 5km every hour. How many hours before Party A can catch up with Party B?

2. Party A and Party B travel in the same direction from cities A and B, which are 36 kilometers apart. Party B is in front of Party A, the speed of Party A is15km, and the speed of Party B is 6km. How many hours before Party A can catch up with Party B?

3. A PLA unit started from the camp and advanced to its destination at a speed of 6 kilometers per hour. Eight hours later, the unit was in a hurry and sent a correspondent to contact at a speed of 54 kilometers per hour by motorcycle. How long will it take the correspondent to catch up with the team?

Xiaoming and Xiaohong's homes are 380 meters apart. They both started from home at the same time and walked on the same straight road. Xiaoming walks 65 meters per minute and Xiaohong walks 55 meters per minute. How many meters may they be apart in three minutes?

Exercise 4:

1. Party A and Party B go from place A to place B at the same time. Party A walks 250 meters per minute and Party B walks 90 meters per minute. After arriving at B, A immediately returns to A and meets B at B1200m. How many meters is the distance between A and B?

2. Both Party A and Party B go from place A to place B at the same time. Party A walks 60 meters per minute and Party B walks 90 meters per minute. After arriving at location B, Party B immediately returns to location A and meets Party A at a distance of 180 meters ... How many meters is between A and B?

3. Party A rides a bike every hour 15km, and Party B walks 5km every hour. If two people start from the same place and the same direction at the same time, Party A will arrive at a place 30km, immediately return from the original road and meet Party B on the way. How many hours did it take from departure to meeting?

4. both parties go from a to b at the same time. Party A travels12m per minute, and Party B travels 9m per minute. Party A traveled 1 8km, went back to get things, and arrived at B1hour later than Party B..A How many meters is there between A and B?

Exercise 5:

1, the speeds of a, b and c are 30m, 40m and 50m per minute respectively. A and B are at A, while C walks in opposite directions at B. After C meets B, it meets A in 10 minutes ... How many meters is there between A and B?

2. Party A walks 75 meters per minute, Party B walks 80 meters per minute, and Party C walks 100 meters per minute. Party A and Party B walk from Dongzhen, while Party C walks in the opposite direction at the same time, and Party C will meet Party A in 3 minutes. What is the distance between the two towns?

There are three buses, one from East Station and the other from West Station. Car A travels at 1000m per minute, car B travels at 800m per minute, and car C travels at 700m per minute. Twenty minutes later, car C meets car A.. What's the distance between East Station and West Station?

Party A, Party B and Party C walk 60 meters per minute, Party B walks 67 meters per minute and Party C walks 73 meters per minute. Party A and Party B go from Nanzhen, while Party C goes in the opposite direction at the same time. After meeting Party B, Party C meets Party A 10 minutes ... What is the distance between the two towns?