Question

Two workers one young one old live together and work at same office it takes 20 minutes for the young to walk to office old men takes 30 minutes for the same distance when will the young may catch up with old man if the old man starts at 10:05 am?

Answer 1

if the old man starts at 10:05 am.
Then 10:05+30=10:35 am.
so the time taken by young man to catch up the old man 10:05+20=10:25 am.