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.