1. The expressway between Jiangyan and Shanghai is 252 kilometers long. Two buses, A and B, sailed from Jiangyan to Shanghai at the same time. Bus A travels 80 kilometers per hour. After 0.8 hours, the distance between the two cars is 16 km. How many kilometers does bus B travel at least every hour?

Solution: 16 ÷ 0.8 = 20km/h (this is the speed difference).

Car b is at least 80-20 = 60 km/h.

2. Both cars of Party A and Party B leave Shanghai and Nanjing relatively at the same time. 3. After1hour, Party A will meet Party B at a point outside the midpoint 12.4 km. The speed of car A is 54 kilometers per hour, and how many kilometers per hour is car B?

Solution: 12.4× 2 ÷ 3. 1 = 8km/h (this is the speed difference).

Speed of car B: 54-8 = 46 km/h.

3. A car and a motorcycle travel in opposite directions from A and B, with a distance of 500 kilometers. The motorcycle leaves at 8: 00 a.m. at a speed of 40 kilometers per hour. The bus leaves at 10 in the morning, with a speed of 60 kilometers per hour. When can two cars meet?

Solution: (500-40× 2) ÷ (40+60)+10 =14.2.

That is 2: 00 p.m. 65438+ 2: 00 p.m.

4.A-B = 3...2, and the sum of A and B is 62. What are a and b respectively?

Solution: Let B be X and A be 3x+2.

x+3x+2=62

x= 15

A is 47

Or (62-2) ÷ (3+ 1) = 15.

5. Xiaoming bought five diaries and used 5.8 yuan more than 1 story book. As we all know, the price of a story book is three times that of a diary. How much is a diary?

Solution: That means five diaries are more than three, 5.8 yuan.

So a diary: 5.8 ÷ (5-3) = 2.9 yuan

Other issues

* 1. Two cars, A and B, leave from two places at the same time. Car A travels 50 kilometers per hour, and after three hours, it has passed the midpoint of 30 kilometers. At this time, the distance between car A and car B is 6 kilometers. How many kilometers does bus B travel per hour?

Solution: Within 3 hours, A walked 30× 2+6 = 66 kilometers more than B.

The speed difference is 66 ÷ 3 = 22km/h.

The speed of B car is 50-22 = 28 km/h.