Task: Question Answering
Input (English): Problem: two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. the ratio of their speeds i
Options: a. 1: 3, b. 3: 2, c. 3: 4, d. 4: 2, e. none of these
Output (English): b