Task: Question Answering
Input (English): Problem: calculate how much time could be saved if the train would run at its usual speed, given that it ran at 2 / 3 of its own speed and got to its destination in 20 hours ?
Options: a. 5.67 hrs, b. 9.67 hrs, c. 8.95 hrs, d. 8.67 hrs, e. 6.67 hrs
Output (English): d