A freight car and a passenger car leave from Jiaji and meet each other in 4 hours. It takes 12 hours for the train to complete the whole journey, and how many hours for the passenger car?

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• 1. The original speed of a car is 30 km / h, now it starts to accelerate evenly, increasing by 204 km / h; a car? A The original driving speed of a car is 30 km / h, and now it starts to accelerate evenly, increasing the speed by 204 km / h per hour; the original driving speed of a car is 90 km / h, and now it starts to decelerate evenly, decelerating by 10 km / h per hour. After how long, the speed of the cars is the same? What is the speed at this time?
• 2. The diameter of a car's outer tire is 9 decimeters, and the wheels roll 1000 cycles per minute. How long does this car advance per hour?
• 3. The distance between the two places is 360km, and they meet in two hours. The speed ratio is 5:4. How many meters are there in each line?
• 4. The two cars start from the opposite direction of a and B. the express train is 70km at one time and the local train is 60km at one time. The two cars meet at 20km away from the terminal. How many kilometers is the distance between a and B Accurate and effective
• 5. There are 1800 kg apples and pears in a fruit shop. One eighth of the apples are sold and 600 kg pears are imported. At this time, the apples are the same as pears. How many kg are the original apples
• 6. Why is DC power equivalent to short circuit in AC amplifier circuit
• 7. My father said, "yes, this is my wish for you."
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• 9. The students went boating in the park. There were 60 people and hired 16 boats. Each big boat made four people and each small boat lived three people. How many boats were there
• 10. It is known that the domain of definition of function f (x) is (0, positive infinity). When x > 1, f (x) > 0, and f (XY) = f (x) + F (y) 1. Find f (1); 2. Prove that f (x) is an increasing function in the domain of definition; 3. If f (1 / 3) = - 1, find the value range of X satisfying the inequality f (x) - f (1 / (X-2)) ≥ 2 Focus on the third question! express thanks on one's knees
• 11. A book, the first day read 20 pages, the second day read 14, two days read a total of 45 pages?
• 12. If the product of 100 rational numbers is positive, how many negative numbers are there at most? What is the sum of all possible negative numbers There are several numbers, the first number is A1, the second number is A2, the third number is A3, etc., and the nth number is an. If A1 = half, starting from the second number, each number is equal to the reciprocal of the difference between 1 and the number in front of it. (1) Try to calculate: A2 = (A3 = (), A4 = () (2) According to the above calculation results, we can guess: A1998 = (), a2000 = ()
• 13. One number in the first bracket, two in the second bracket, three in the third bracket and one in the fourth bracket The cycle is divided into (1), (3, 5), (7, 9, 11), (13), (15, 17), (19, 21, 23), (25) Then the sum of the numbers in the 50th bracket is () A. 390B. 392C. 394D. 396
• 14. Find the next number of the sequence 0.5 1 2 5 17 107
• 15. How to fill in 2, 3, 4, 5, 6, 7, 8, 9 and 10 in the nine palace space, so that the sum of the three numbers in each horizontal, vertical and oblique row is equal to 18
• 16. (1) We know that 1 + 3 = 4 = 2, 1 + 3 + 5 = 9 = 3, 1 + 3 + 5 + 7 + 9 = 25 = 5 Following the example above, calculate 1 + 3 + 5 + 7 + +99=? According to the above rule, please use the natural number n (n is greater than or equal to 1) to express the general rule (2) Look at the following equation. Please use the equation about n to show the law you found 9-1=8,16-4=12,25-9=16,36-16=20…… (3) Given that the square of (2x-1) = the square of AX + BX + C, find the value of a + C, 4A + B + 4C
• 17. A simple method of 1500-2000 + 1999-1998 + 1997 -. - 4 + 3-2 + 1
• 18. There were two granaries A and B. in the past, warehouse B stored 1 / 5 less grain than warehouse A. now, 1 / 4 of warehouse A's stock is put into warehouse B, and then 30 tons are transported from warehouse B. at this time, the two granaries stored grain together (don't use equations)
• 19. A, B and C make 940 parts at the same time. It takes 5 minutes for a part to be made by a, B and C, which is 25% more than that of B. the time for C to make a part is two fifths less than that of A. how many parts does a, B and C make?
• 20. The sum of a and B is - 2.6, B is - 7.5, how much is B bigger than a? The difference between a and B is - 4 / 3, B is - 1 / 6, what is a Please help me, thank you