A, B and C are three stations on the same road. The distance from station B to station a and C is equal. Xiaoqiang and Xiaoming start from station a and C at the same time and face each other. Xiaoqiang meets Xiaoming 100 meters after station B, and then they go on. Xiaoqiang returns to station C, and overtakes Xiaoming 300 meters after station B. question: what's the distance between station a and station B? Do you know how to solve this problem

The distance between station a and station B is 300 meters
Xiaoqiang and Xiaoming's speed and speed ratio remain unchanged
Suppose: the distance between station a and station B is x meters
First meeting: Xiaoqiang goes x + 100, Xiaoming goes X-100
The first chase and encounter: Xiaoqiang goes 3x + 300, Xiaoming goes x + 300
（x+100）/（x-100）=（3x+300）/（x+300）
3x-300=x+300
X = 300 (m)

A minimalist fraction expands the numerator to three times the original one, and reduces the denominator to one-third of the original one, which is equal to three and one-half. What is the original minimalist fraction?

Let this number be x / y
3x/(1/3y)=7/2
x/y=7/18
That's 7 / 18

A dog can run 6 steps in 4 steps. The distance of a horse running 3 steps is equivalent to the distance of a dog running 6 steps. Now that the dog has run 600 meters, the horse begins to chase the dog. How many meters can the horse catch up with the dog?

36 × [600 ／ (36-12)] = 36 × [600 ／ 24] = 36 × 25 = 900 (m); a: a horse can catch up with a dog after running 900 M

At 8:00 a.m., Li Hua and Zhang Tao set out from a and B at the same time, facing each other. It is known that Li Hua's speed is 4 kilometers faster than Zhang Tao's. at 10:00 a.m., they are 48 kilometers apart, and at 12:00 p.m., they are 48 kilometers apart. Try to find the distance between a and B

It's two hours from 10 a.m. to 12 noon
The two traveled together: 48 + 48 = 96 km
The sum of the two people's speed per hour is 96 △ 2 = 48 km
It's two hours from 8 a.m. to 10 a.m
The AB distance is:
48 × 2 + 48 = 144 km

Jilin one day the highest temperature is 4 ℃, the lowest temperature is - 3 ℃, then, Jilin day temperature difference is___ ℃．

4 - (- 3) = 4 + 3 = 7 (℃)

What number is added to the numerator and denominator of the 1997 / 1999 fraction to get a new fraction equal to 1999 / 2000?
The sum of numerator and denominator of a fraction is 21, and the simplest fraction is 1 / 4 when denominator is increased by 19

Now add 2 to the numerator, and the denominator is less than 1, so double the numerator and denominator of the latter fraction. 1999 / 2000 = 3998 / 40003998-1997 = 20014000-1999 = 2001. So add 2001 at the same time. After the denominator is increased by 19, the sum of numerator and denominator of 1 / 4 before simplification is 21 + 19 = 40, which is 8 now

What's the altitude of the second highest peak in the world?

"Qiaogoli", in Tajik language, means "tall and majestic". Qiaogoli peak is 8611 meters above sea level. It is the main peak of the Karakoram mountains and the second highest peak in the world, also known as K2 peak abroad
Qiaogeli peak is located at 76.5 E and 35.9 n, in the middle part of Karakorum mountain. It belongs to one side of China, in Yecheng County of Xinjiang Uygur Autonomous Region
The Karakoram mountains stretch for thousands of kilometers, running from northwest to Southeast, with a general altitude of more than 6000 meters. There are dense peaks in the mountains, including the qiaogeli peak, which is closely connected with four world-class famous peaks of more than 8000 meters: the east side of qiaogeli peak is bulaote peak, with an altitude of 8051 meters, followed by jiashur brumu mountain, with an altitude of 8068 meters, and jiashur brumu II peak, The altitude is 8035 meters. There are 14 peaks of more than 8000 meters in the world, accounting for nearly one third. There are more than 20 peaks of more than 7000 meters. The north side of skyang Kanli peak is 7545 meters above sea level, the west side of spender peak is 7385 meters above sea level, and the lower side of crown peak is 7295 meters above sea level

Party A and Party B are facing each other from a and B at the same time. When they meet, they are 120 meters away from A. after meeting, they continue to move forward, return to their destination immediately, and meet again 150 meters away from A. the distance between a and B is______ Rice

(120 × 3 + 150) △ 2 = 255 (m); answer: the distance between AB and ab is 255 M

Is chogory the second highest peak in the world

"Qiaogoli", in Tajik, means "tall and majestic". Qiaogoli peak is 8611 meters above sea level. It is the main peak of the Karakorum Mountains and the second highest peak in the world. It is also known as K2 peak in foreign countries. Qiaogoli peak is located at 76.5 degrees east longitude and 35.9 degrees north latitude in the middle of the Karakorum Mountains. It belongs to one side of China, In Yecheng County, Xinjiang Uygur Autonomous Region, it is recognized as one of the most difficult mountains in the world

There is a natural number, which can be used to remove 63, 90130 and have remainder respectively. The sum of the three remainder is 25. What is the largest of the three remainder?

Let this natural number be m, and M remove 63, 90130, and the remainder is a, B, and C respectively, then 63-a, 90-b, and 130-c are all multiples of M. it can be obtained that: (63-a) + (90-b) + (130-c) = 283 - (a + B + C) = 283-25 = 258 is also a multiple of M. and 258 = 2 × 3 × 43. Then it may be 2 or 3 or 6 or 43; a + B + C = 25, so at least one of a, B, and C must be greater than 8 Must be greater than the remainder, can be determined = 43. Thus a = 20, B = 4, C = 1. Obviously, 20 is the largest of the three remainder. Answer: the largest of the three remainder is 20