(2) When x < 125min, A is economical; When x= 125min, A and B are the same; When x= 125min, b is economical.

2、y 1=0.58x y2=0.28x+600

② When y 1=y2= 1500,

y 1= 1500=0.58x

x≈2586

y2= 1500=0.28x+600

x≈32 14

Choose road transportation

When x= 1500,

y 1=0.58× 1500=870

y2 = 0.28× 1500+600 = 1020

Choose railway transportation