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Math application problems in the second day of junior high school. . Online, etc
This kind of problem can be easily solved by list method.

Solution: Let the walking time be 3-x) h and the ride time be (3-x) h.

Tabulation/listing

Speed: 60 times 3-x Distance: 60(3-x)

Human speed: 4 times x distance: 4 times

Take distance as an equal relationship.

60(3 x)+4x = 40

Solution: x=2.5