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Olympic starting line (grade five)
1. solution: let Xiao Li ride a bike at a speed of x kilometers per hour.

(x+4.5)2.5=50-4.5× 1.5

2.5x+ 1 1.25=50-6.75

2.5x=32

x= 12.8

A: Xiao Li rides a bike at a speed of 12.8km per hour.

2. solution: it took x hours for the cash truck to travel from place a to place B.

(x+0.5)× 10/0.5=60

20x+ 10=60

20x=50

x=2.5

A: Bus A traveled from place A to place B for 2.5 hours.

This is the solution of an equation. I wish you success!

Happy Chinese New Year of the Ox