Task: Question Answering
Input (English): Problem: a, b, k start from the same place and travel in the same direction at speeds of 30 km / hr, 40 km / hr, 60 km / hr respectively. b starts seven hours after a. if b and k overtake a at the same instant, how many hours after a did k start ?
Options: a. 3, b. 4.5, c. 4, d. d. 5.5, e. e. 14
Output (English): e