The distance between the two places is 270 kilometers. A and B cars leave from the two places at the same time. They meet in three hours. The speed ratio of a and B cars is 5:4, and the speed of the two cars is 5:4 The distance between the two places is 270 kilometers. A and B cars leave from the two places at the same time and meet each other in three hours. The speed ratio of a and B cars is 5:4. What's the speed of the two cars?

Because the speed ratio of car a and car B is 5:4, we can set the speed of car a as 5x and that of car B as 4x
According to the meaning of the title:
（5X+4X）*3=270
9X=90
X=10
5 * 10 = 50 (km / h)
4 * 10 = 40 (km / h)
A: the speed of car a is 50 km / h, and that of car B is 40 km / h

If we know that positive integers a, B, C (where a ≠ 1) satisfy ABC = AB + 30, then the minimum value of a + B + C is; the maximum value of a + B + C is;
If a positive integer a, C (where a ≠ 1) satisfies a ^ b * C = a ^ B + 30, then the minimum value of a + B + C is; the maximum value of a + B + C is; the minimum value of a + B + C is; the maximum value of a + B + C is;
0 - 14 days and 23 hours to the end of the problem

The minimum is 11; the maximum is 19

Pingle village residence in Qing Dynasty. Who is the white haired Weng Jia? Da'er hoes to the east of Douxi, while Zhong'er weaves chicken coops. Most like children rogue, stream head lie peel lotus. 1. What is the name of this word &The title is &The author is Poets of the Qing Dynasty 。 &I also know some brand names, such as 、 &And so on. 3. How long has this word been written Two characters, they are &The & nbsp; & nbsp & nbsp; & nbsp & nbsp & nbsp; & nbsp & nbsp; & nbsp & nbsp; & nbsp & nbsp; & nbsp & nbsp & & nbsp & nbsp; & amp & amp & nbsp; & amp & nbsp; & amp & amp & nbsp; & amp & amp & nbsp; & & nbsp & nbsp; & amp & amp & nbsp; & amp & amp & nbsp & amp & amp & nbsp & & nbsp; & nbsp & amp & amp & amp & amp & nbsp; & amp & amp & amp & amp & amp & amp & amp & amp & amp & AMP & amp & amp & amp & amp & amp & amp & nbsp; & amp & amp & amp & amp & amp & amp & amp & amp & amp & nbsp; & & nbsp; & nbsp; & amp & amp & amp & nbsp; & amp & nbsp; & nbsp; & nbsp; & amp & nbsp; & nbsp; & amp & nbsp; & nbsp; & amp & nbsp; & nbsp; & nbsp; & nbsp; & nbsp & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp & nbsp; & nbsp & nbsp; & nbsp sp; expresses the essence of rural life 。 4. The reasons why the author likes children best are as follows__ 。

If the distance of car B is x km at 10 a.m., then the distance of car a is 5x km, then the time of car a driving before 10 a.m. is 5x55 hours, and that of car B is x55 hours. According to the meaning of the question, we can get the equation: 5x55 + 2 = 3 × (x55 + 2), & nbsp; & nbsp; 2x = 220, & nbsp; & nbsp; & nbsp; & nbsp; X = 110, so before 10 o'clock, a's driving time is: 5x55 = 5 × 11055 = 10 (hours), B's driving time is x55 = 11055 = 2 (hours), 10-2 = 8 (hours). A: B starts 8 hours later than a's

What's three is zero fifteen?

Three twenties is zero fifteen

In April 2007, China's train speed was increased for the sixth time. The average train speed on the main line increased from 160 km / h to 200 km / h?

（200-160）/160*100%＝25%
Train speed increased by 25%

What is the number of monomials

It's the sum of the times of all the letters
For example: X & # 178; Y & # 179; Z: times = 2 + 3 + 1 = 6 times

For a batch of cement, 4 / 9 is used, and the rest is a fraction

Remaining: 1-4 / 9 = 5 / 9
The rest is to use:
5/9÷4/9=5/4

In the acute angle △ ABC, the vertical bisectors of edges AB and AC intersect at point O, and the value of ∠ BOC is calculated

As shown in the figure, the vertical bisectors of ∵ side AB and AC intersect at the point O. the point O is the center of the inscribed circle of the acute angle △ ABC, and ∵ BOC = 2 ∵ a = 2 × 52 ° = 104 °, that is ∵ BOC = 104 °

There is a square paper with an area of 1 square meter. Half of it was cut off for the first time, and the remaining half was cut off for the second time. What is the area of the remaining paper after the fifth time?

The fifth power of (2 / 1) = 32 / 1

If the area of the triangle formed by the rainfall coordinate axis of the image with the first-order function y = 3x + m is 24, then M=
If the area of the triangle formed by the rainfall coordinate axis of the image with the first-order function y = 3x + m is 24, then M=

Because the linear function y = 3x + m and the axis of the coordinate form a triangle, we can get the intersection point with the axis of the coordinate, x = - M / 3, y = m, then the area of the triangle is (M / 3 * m) / 2 = 24, that is, m ^ 2 = 144, M = 12 or - 12