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Math problems .. (for me)
When they meet, two cars go 170.

A Go first 40* 1/2=20.

170-20= 150 left.

The express train took 20 minutes to repair the car, and B left 30* 1/3= 10.

The remaining150-10 =140.

When Party A stops for maintenance, it will be (X+ 1/3) hours after the delay of X hours.

Set the local train to leave for (X+ 1/3) hours and meet the express train.

Equation: 40x+30 (x+1/3) =170-40 *1/2.

X=2

X+ 1/3=7/3 hours = 140 minutes.