X/60 -2=X/75

X=600 kilometers

2 set up the original x people in the second workshop.

200-20=X+20

X= 160 people

3. The bus travels x kilometers per hour, and the truck travels X-6 kilometers.

3X+(X-6)x3=360

6X=378

X=63

63-6=57

Suppose the Xiao Fang family saves X yuan every month,

X+3.5X=2400+2 100

X= 1000

1000x3.5=3500 yuan