Xiao Ming set off by bicycle from his home and took a straight road to the post office 2400m away

Summary. A: The average speed of Xiao Ming from home to the library is 6 kilometers per hour.

Xiao Ming went to the library from home to study, the first half of the ride was ridden, the first 12 kilometers per hour, the second half of the distance was on foot, 4 kilometers per hour, asked Xiao Ming the average speed from home to the library?

A: The average speed of Xiao Ming from home to the library is 6 kilometers per hour.

Analysis: Let the whole journey be 24 kilometers (other numbers can also be set), 12 12 + 12 4 = 1 + 3 = 4 (hours) 24 4 = 6 (1,000 square meters) Answer and celebrate: The average speed of Xiao Ming's complete journey is 6 kilometers per hour.

Analyze the pin: To find the average speed of the whole journey, you should divide the whole journey by the time it takes to travel the whole journey. Since the question does not tell us the distance between A and B, we can set the whole journey to 24 kilometers (and other numbers can be set for loss), so that the time taken to travel is 12 12 + 12 4 = 4 (hours), and the average speed of the whole journey is 6 kilometers per hour with 24 4.

Summary. Xiao Ming set off from home, riding a bicycle to leave home, kilometers of shopping in the core of the pure heart, if Xiao Ming rides a bicycle at a speed of every minute and kilometers, after he rides for five minutes, how many kilometers are there in the center of the dust to solve the equation?

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The distance from home to the library is, so the time to get home t=divided by 2=hours.

My brother was holding a book all day long, with short hair and a pair of eyes on the bridge of his nose, he was very tall.

My parents took me to my brother's house, and my brother walked out of the study with a book in his hand, and greeted my parents and said, "Uncle, hello aunt." Mom and Dad also nodded again and again:

Good, good. After that, the elder brother returned to the study, sat on the sofa, crossed Erlang's legs, put the book on his lap, and began to read the book with relish again, and the guests were all under the care of the eldest mother. followed my brother into the study, "Wow!

The bookcase was filled with rows of books, and there were several boxes on the floor, which were also full of books. Classical classics, history, prose, **......As long as you can name the title, he will probably have it.

On Sunday, we went to my grandmother's house for dinner, and when he came, he carried a bag in his hand, what was in the bag? It's not going to be a book again. Sure enough, as I expected, it was a book, outside of class, and in class.

As soon as my brother shuddered or put down the bag, he pulled out a copy, what "Can mosquito blood really make dinosaurs?" What a novelty book!

After eating, the table was full of big fish and meat, but these dishes did not attract my brother, my brother served the rice, picked up the chopsticks and ate quickly, stirred the food together, and pulled it into his mouth, as if he was afraid that the dishes would be eaten up later. After eating, I put the chopsticks on the table, and I put up my legs to read the book, which has been replaced by another book, called "Curious African Animals and Plants". I said:

Did you finish reading one just now? He didn't hear it, he didn't hear the good-looking TV series next to him, and he didn't notice it when grandma gave us fruit.

On the way to the car, he took out another textbook from his bag, leaned on the back of the car seat, and concentrated. I thought: Won't my brother have a headache? The car is rocking, and it is no wonder that the eyes are short-sighted. He is really a book lover, and he loves to read books to this extent.

This is my book lover brother, who lets books occupy every second of every group.

225 10 2250 m km.

Because the kilometer Hengyuan is 3 kilometers, Xiao Ming can't get there in 10 minutes.

There are still 3 kilometers and 750 meters away from the library.

The distance from Xiao Ming's house to the library is 3000 meters, and he walks 225 meters per minute, so it takes 3000 225 minutes to get to the library, so ten minutes is not a sign. If you ride for ten minutes, you will walk 225 10 = 2250 meters, and there will be 3000 2250 = 750 meters from the library. Huai ruined.

Xiao Ming can't arrive in ten minutes. 3000 225 = minutes to reach the chaotic mu, that is, about 13 minutes to arrive, and ten minutes he can only crack the forest to 225 10 = 2250 meters, so Xiao Ming is still 3000-2250 = 750 meters away from the library in ten minutes. Companionship.

225 meters in one minute, 225 10 = 2250 meters in ten minutes, and the dust scraping is a total of 3000 meters, so there are 3000-2250 = 750 meters, and it takes 750 225 = minutes.

According to the question, the most direct algorithm to obtain the result of Huai Hao is as follows:

The ten-minute riding distance is 225*10=2250 meters, which is less than 3000 meters and the sail is bent, so it can't be reached. Lead scattered.

The distance from the library is 3000-2250=750 meters.

I can't get there. Riding distance = riding speed * riding time = 225 * 10 = 2250 meters.

3,000 bumps with rice = 3,000 meters with a smile.

225x10 = 2250 (m) = km 3 km.

km) = 750 meters.

A match of 225 meters in minutes, 225 10 = 2250 meters in ten minutes, a total of 3000 meters of bending and selling town, so there are 3000-2250 = 750 meters, it takes 750 225 = minutes.

He rode his own Sakura bumper car to travel 225 meters per minute, and the 10-year-old Song Zheng walked 2,250 meters < 3,000 meters per minute. So I can't get to the library in ten minutes.

There are 3000-2250=750 meters from the library.

Summary. Dear, Xiao Ming's house is 2500 meters from the company.

Dear, Xiao Ming's house is 2500 meters from the company.

7:10-7:00=10 (min) 250x10=2500 (m).