When a and B start, the speed ratio of a and B is 5; 4. After meeting, a's speed decreases by 20%, and B's speed increases by 20%. Thus, when a arrives at B, B is still 10 kilometers away from A. how far is a and B from each other? How do you write it? I'm in a hurry

After meeting, the speed ratio of a and B is: [5 × (1-20%)]: [4 × (1 + 20%)] = 5:6
After meeting, there is a whole distance between a and B: 4 △ 4 + 5 = 4 / 9
So when a arrives at B, B leaves a: 1 - (4 / 9) - (4 / 9) × (6 / 5) = 1 / 45
That is, 10 km accounts for 1 / 45 of the whole AB journey
The distance between the two places of AB: 10 ÷ (1 / 45) = 450 km

RELATED INFORMATIONS

1. Vector in Physics
2. 20 kg of apples and 30 kg of pears cost 132 yuan in total. The price of 2 kg of apples is equal to that of 2.5 kg of pears. How many yuan per kg of apples and pears?
3. 2. Let X and y be real numbers, and (x / 1 + I) * (Y / 1-2i) = 5 / 1-3i, find x + y
4. Party A and Party B run on a 400 meter circular track. Party B runs 120 meters per minute on average. The speed of Party A is 1.5 times that of Party B, and Party A is 100 meters in front of Party B, How many minutes can a catch up with B? Solve the equation
5. My aunt bought a total of 5 kg of cucumber and cabbage, which cost 17 yuan, of which 4 yuan per kg of cucumber and 3 yuan per kg of cabbage,
6. A and B start from 120 kilometers at the same time, B is in front. The speed of a and B is 60 km and 40 km. How long can a catch up with B after departure A and B start at the same time from two places 120 kilometers apart, and B is in front of A. the speed of a and B is 60 km / h and 40 km / h respectively. How long can a catch up with B after departure?
7. There's also a math problem, 4/x²-1+x+2/1-x=-1
8. When the aircraft flies, the flight direction is expressed by the angle between the flight route and the actual South or north direction line. As shown in the figure, the clockwise angle between an (north-south line) and the flight line is used as the flight direction angle. The flight direction angle from a to B is 35 °, the flight direction angle from a to C is 60 ° and the flight direction angle from a to D is 145 °. The angle between AB and AC is multiple Less? What is the angle between AD and AC? And draw the flight line from a with 105 ° angle
9. If x-3y = 5, find the value of x ^ 2-3xy-15y Please ~~
10. The relation between the N + 1 power of N and the n power of (n + 1)
11. On the inequality of X, the solution set of root x > ax + 1.5 is {x | 4
12. The distance between port a and port B is 1200km. Ship a sails from port a to port B at 60km per hour. After 30 minutes of departure, ship B sails from port B to port a at 70km per hour. The two ships meet a few hours after departure
13. How do three odd numbers add up to an even number**********
14. 24 plus 4 is 28. Is 28 odd or even
15. The constant term in the expansion of binomial (x3 − 1x2) 5 is______ ．
16. How to find the constant term of binomial
17. What is the meaning of constant term in binomial I'd like to give you an example. Thank you
18. How to find the constant term of binomial? As shown in the picture, thank you! I don't understand. What's the principle? Explain it. The formula is too messy
19. How to find the constant term in binomial expansion
20. To find the constant term in the expansion of binomial (x + Z / X-2), the general term formula method is used, Yes (x + 1 / X-2)