Current location - Training Enrollment Network - Mathematics courses - The whole process of solving the second and third questions in the second volume of the seventh grade mathematics textbook published by People's Education Press.
The whole process of solving the second and third questions in the second volume of the seventh grade mathematics textbook published by People's Education Press.
1, let the average aircraft speed be x km/h and the wind speed be y km/h.

{5/2(x+y)= 1200, 10/3(x-y)= 1200

x=420,y=60

A: The average speed of the plane is 420km/h and the wind speed is 60km/h..

2. Let the average speed be x km/h on the first day and y km/h on the second day.

{5y-4x=2,4x+5y=98

x= 12,y= 10

Answer: the average speed on the first day is 12km/h, and the average speed on the second day is10 km/h.