Fifth grade practical problems (solving equations) 1. A circular runway is 800 meters long. Party A and Party B set out from AB, 200 meters apart, in the same direction at the same time. When they set out, Party A was behind and Party B was ahead. 10 minutes later, Party A overtook Party B. It is known that Party B travels 50 meters per minute. Question: how many meters does party a travel per minute? 2. The distance between Party A and Party B is 120 km. The passenger cars and freight cars start from place a to place B at the same time. The passenger cars travel 20 km per hour, and the freight cars 60 km per hour. When the freight cars arrive at place B, they immediately go to place B. Q: how long does it take for the freight cars to meet the passenger cars after they arrive at place B? How far is it from place a at this time? 3. The distance between Party A and Party B is 280 kilometers, and the bus and truck start from place a to place B at the same time. The bus travels 35 kilometers per hour, which is half the speed of the truck. When the truck arrives at place B, it immediately drives to place a, and then it meets the bus two hours later 4. Mr. Zhang and Mr. Wang started from school to the children's palace at the same time. Two minutes later, Mr. Zhang found that he didn't bring the certificate, so he ran back to school to get it. Mr. Wang continued to walk. Mr. Zhang's running speed was 100 meters, and Mr. Wang's walking speed was 50 meters per minute? 5. Dad and mom set out from home for dinner at the same time. Six minutes later, they found that they didn't have any money with them. So Dad rode back to get the money, while mom continued to walk to the hotel. After six minutes, they arrived at the hotel at the same time. It was known that mom walked 50 meters per minute and dad rode 150 meters per minute. How far was it from home to the hotel? 6. A circular runway is 600 meters long. Party A and Party B start from the starting point at the same time and go in opposite directions. Two minutes later, Party A turns to chase Party B. It is known that Party A does not go 60 meters per minute, while Party B goes 40 meters per minute. Question: how long has it taken from the starting point to the meeting point, and how far is it from the starting point?

Fifth grade practical problems (solving equations) 1. A circular runway is 800 meters long. Party A and Party B set out from AB, 200 meters apart, in the same direction at the same time. When they set out, Party A was behind and Party B was ahead. 10 minutes later, Party A overtook Party B. It is known that Party B travels 50 meters per minute. Question: how many meters does party a travel per minute? 2. The distance between Party A and Party B is 120 km. The passenger cars and freight cars start from place a to place B at the same time. The passenger cars travel 20 km per hour, and the freight cars 60 km per hour. When the freight cars arrive at place B, they immediately go to place B. Q: how long does it take for the freight cars to meet the passenger cars after they arrive at place B? How far is it from place a at this time? 3. The distance between Party A and Party B is 280 kilometers, and the bus and truck start from place a to place B at the same time. The bus travels 35 kilometers per hour, which is half the speed of the truck. When the truck arrives at place B, it immediately drives to place a, and then it meets the bus two hours later 4. Mr. Zhang and Mr. Wang started from school to the children's palace at the same time. Two minutes later, Mr. Zhang found that he didn't bring the certificate, so he ran back to school to get it. Mr. Wang continued to walk. Mr. Zhang's running speed was 100 meters, and Mr. Wang's walking speed was 50 meters per minute? 5. Dad and mom set out from home for dinner at the same time. Six minutes later, they found that they didn't have any money with them. So Dad rode back to get the money, while mom continued to walk to the hotel. After six minutes, they arrived at the hotel at the same time. It was known that mom walked 50 meters per minute and dad rode 150 meters per minute. How far was it from home to the hotel? 6. A circular runway is 600 meters long. Party A and Party B start from the starting point at the same time and go in opposite directions. Two minutes later, Party A turns to chase Party B. It is known that Party A does not go 60 meters per minute, while Party B goes 40 meters per minute. Question: how long has it taken from the starting point to the meeting point, and how far is it from the starting point?

The lion opens his mouth

The two trains leave 525km apart from each other at the same time and meet three hours later. One train runs 90km per hour, and the other train runs how many km per hour?

525 △ 3-90 = 175-90 = 85 km. A: another train runs 85 km per hour

Practical problems are solved in two ways (1. Ordinary solutions; 2. Equations need more steps.)
Team a and team B jointly dig a 1160 km long tunnel. Team a digs from east to west, 75 meters per day. Team B digs from East, 5 meters less than team a every day. The two teams work together for several days

1. B = 75-5 = 70 meters per day;
Time = 1160 (70 + 75) = 8 days;
2. If it takes X days to complete, there are:
75x+（75-5）x=1160；
75x+70x=1160;
145x=1160;
x=8;
So it takes eight days
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