Xiao Wang and Xiao Li process a batch of parts at the same time. Xiao Wang processes eight parts per hour in the first half and ten parts per hour in the second half. Xiao Li processes eight parts per hour in the first half and ten parts per hour in the second half?

Xiao Wang and Xiao Li process a batch of parts at the same time. Xiao Wang processes eight parts per hour in the first half and ten parts per hour in the second half. Xiao Li processes eight parts per hour in the first half and ten parts per hour in the second half?

Suppose there are x parts in total,
Xiao Wang's time:
1 / 2x △ 8 + 1 / 2x △ 10 = 1 / 2x × (1 / 8 + 1 / 10) = 9 / 80x (hours)
Time for Xiao Li:
X △ [(8 + 10) × 1 / 2] x △ 9 = 1 / 9x (hours)
However, 9 / 80x & nbsp; & gt; & nbsp; 1 / 9x & nbsp;
Therefore, Xiao Li finished processing first

An express train runs from station a to station B at a speed of 62 km / h. one hour later, a slow train runs from station a at a speed of 55 / h. When the express train arrives at station B, the slow train is 195 km away. How many km are there between the two places?

The express train runs from station a to station B for a total of X hours, and the distance between the two stations is y km,
The equations are: 62x = y
(x-1)*55=y-195
By solving the equations, we can get x = 20, y = 1240
Therefore, the distance between the two stations is 1240 km
You can understand, agree

1 a project can be completed in 12 days by two persons. The first step is to do other work after 2 days, and then to do 3 days by B. At this time, 4 of 1. of the work has been done. This project is done by B alone. How many days will it take to complete it?
2. There are two bags of rice, one is 123kg in bag a and the other is 45kg in bag B. in order to make the rice in bag a 2.5 times of that in bag B, how much kg should be poured into bag B from bag a?
3. My father is 33 years old and my daughter is 6 years old. In a few years, will my father be four times as old as my daughter?
It's solved by equations, all of them!

2. Suppose that it should be poured from bag a into bag B XKG. 123-x = 2.5 (45 + x) 123-x = 112.5 + 2.5x 1.5x = 10.5 x = 7 answer: it should be poured from bag a into bag B 7kg. 3. Suppose that after X years, the age of father is 4 times that of daughter 33 + x = 4 (6 + x) 33 + x = 24 + 4x 3x = 9 x = 3 answer: after 3 years, the age of father is 4 times that of daughter

1. Yanyan has two pieces of RMB 2 yuan and five yuan, which is exactly 64 yuan. How many pieces of RMB 2 yuan and five yuan are Yanyan?
2. At present, the same number of chickens and rabbits live in the same cage. It is known that there are 22 more rabbit legs than chicken legs. How many chickens and rabbits are there in the cage?
Sorry, Yanyan has 20 pieces of RMB 2 and 5.

1. Suppose 5 yuan has x sheets, then 2 yuan has 20-x sheets,
5x+2(20-x)=64
x=8
20-8 = 12 (sheets)
Answer: 5 yuan 8 pieces, 2 yuan 12 pieces