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The problem of the first trip in mathematics
Let the slowest speed be x kilometers per hour.

The fastest is1.4x.

Meet for the first time, the fastest 1 week, 7 kilometers.

35 minutes =35/60 hours

So 35/60( 1.4x-x)=7.

0.4x=7÷35/60= 12

x= 12÷0.4=30

1.4x=42

A: The slowest speed is 30 kilometers per hour and the fastest speed is 42 kilometers per hour.