When will the young man catch up the old man, if the old man starts at 10.00am and the young man starts at 10.05am?

Question

Two workers, one old and one young, live together and work at the same office. The old man takes 30 mins where as the young man takes only 20 mins to reach the office. When will the young man catch up the old man, if the old man starts at 10.00am and the young man starts at 10.05am?

Answer 1

After 15 mins (@ 10:15) the young man will make 10 mins and both will make half of the distance and the young man will reach the old man