Ask for the answer to the fifth question (1) on page 465438 and the seventh question on page 42 of the sixth grade mathematics workbook of People's Education Edition.
Page 465438 +0 Question 5: 80%x-28= 1/3x
x =60
Page 42 Question 7: Solution: Set the time to X and use 6-x when flying back.
1500x=(6-x)× 1200
x=8/3
8/3× 1500=4000 km
Answer: 4,000 kilometers