Solving practical problems 1. Two children took the elevator. They thought the elevator was too slow. At the same time, they went up. Xiao Ming walked for 5 minutes, 20 steps per minute. Xiao Hong walked for 6 minutes, 15 steps per minute. How many steps are there in this elevator? 2. The speed ratio of train a and B is 5:4. Train B starts from station B to station a first. When it reaches 12 km away from station B, train a starts from station a to station B. when the two trains meet, the distance ratio between station a and station B is 3:4

Solving practical problems 1. Two children took the elevator. They thought the elevator was too slow. At the same time, they went up. Xiao Ming walked for 5 minutes, 20 steps per minute. Xiao Hong walked for 6 minutes, 15 steps per minute. How many steps are there in this elevator? 2. The speed ratio of train a and B is 5:4. Train B starts from station B to station a first. When it reaches 12 km away from station B, train a starts from station a to station B. when the two trains meet, the distance ratio between station a and station B is 3:4

1.5 (x + 20) = 6 (x + 15) leads to x = 10, so the elevator has 150 steps
2. (5xt) / (12 + 4xt) = 3 / 4, then XT = 4.5
So the distance between AB and S = (5xt) 7 / 3 = 52.5
Where 5x is the speed of car a, and t is the driving time of car a from station a to the time when the two cars meet

Solving the problem of proportion calculation
About 100

First, you can go to the relevant forum to ask such questions
Second, you can also go to the relevant enterprises to ask
Third, in general, such departments know more about it
Fourth, there are various online answers, only the local answers are the most authoritative and accurate
Fifth, I wish you a smooth work, a prosperous career, a healthy life and a happy family

300 solving proportion calculation problems,
To calculate, not to apply

1.38:60=x:30
2.25:40=x:60
3.11:50=x:100
4.18:25=x:75
5.85:1664=x:6124

It takes 24 minutes to saw a piece of wood into four sections. According to this calculation, how many minutes does it take to saw the piece of wood into seven sections?

Suppose that it takes X minutes to saw 7 segments, then 244 − 1 = X7 − 1, & nbsp; 243 = X6, & nbsp; & nbsp; 3x = 24 × 6, & nbsp; & nbsp; 3x = 144, & nbsp; & nbsp; X = 48. A: it takes 48 minutes