Task: Question Answering
Input (English): Problem: the ratio between speed of the two trains is 7: 8. if the 2 nd train runs 400 km in 4 hrs, what is the speed of the 1 st train ?
Options: a. 87.9, b. 87.5, c. 87.7, d. 87.6, e. 43.3
Output (English): b