Task: Question Answering
Input (English): Problem: a start walking from a place at a uniform speed of 4 kmph in a particular direction. after half an hour, b starts from the same place and walks in the same direction as a at a uniform speed and overtakes a after 1 hour 48 minutes. find the speed of b.
Options: a. 4.7 kmph, b. 4.6 kmph, c. 4 kmph, d. 7 kmph, e. 5.3 kmph
Output (English): b