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 is :
Options: a. 3 / 7, b. 3 / 2., c. 3 / 88, d. 3 / 8., e. 2 / 2.
Output (English): b