(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