Task: Question Answering
Input (English): Problem: two trains leave a station traveling the same direction. train a leaves the station traveling at a constant speed of 60 mph, and train b leaves the station traveling at a constant speed of 80 mph. if both trains maintain constant speeds, in how many minutes will train b overtake train a if train a left 40 minutes prior to train b ?
Options: a. 90, b. 100, c. 110, d. 120, e. 130
Output (English): d