1. At the same time, there are two cars starting from two cities, A and B. A's car is 38 kilometers per hour and B's car is 42 kilometers per hour. Four and a half hours later, two cars met. What's the distance between a and b?

2. Two road construction teams build a road with a length of12000m. One team builds 1 15m every day, and the other team builds 125m every day. How many days can it be finished?

A truck and a car set off from two cities, A and B, respectively. Trucks travel 40 kilometers per hour and cars travel 60 kilometers per hour. They will meet in six hours. How many kilometers are the two cities apart?

4. A truck and a car drive from city A to city B at the same time. The truck traveled at a speed of 40 kilometers per hour, and the car traveled at a speed of 60 kilometers per hour for six hours. How many kilometers are the two cars apart?

The speed of the express train is 60 kilometers per hour, which is 1.5 times that of the local train. Now two trains depart from AB, which is 240 kilometers apart, and meet somewhere. How many kilometers is the meeting place from AB?

6. It takes 40 days to build a canal, 60 meters a day.

(1) If you repair 20 meters more every day, how many days will it take?

(2) If you repair 80 meters every day, how many days in advance can you finish it?

(3) If the project is to be completed 20 days in advance, how many meters will it take to repair every day?

7. Zhang Li bought three pencils and five exercise books, and * * * used 8.4 yuan. Every exercise book 1.2 yuan is known. How much is each pencil?

8. The construction team built a highway with a length of 12.6 km, with an average of 2.4 km per month in the first three months. If the rest is repaired 2.7 kilometers per month, how many months will it take to complete it?

9. Two passenger ships leave from two ports at the same time. The first ship travels 40 kilometers per hour and the second ship travels 36 kilometers per hour. Depart at 8 o'clock in the morning and meet at 1 1 in the evening. How many kilometers are the two ports apart?