You will be given a definition of a task first, then some input of the task.
The task is to generate the correct answer for a given math problem.

Problem: a start walking from a place at a uniform speed of 7 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 .
Output:
7.6 kmph