Usually by what age does a person reaches his/her full height?
Usually by the age of 18, a person reaches his/her full height.
By walking at 34 th of his usual speed, a man reaches office 20 minutes later than usual. How much time does he usually take?
What is the minimum length of a plane mirror required for a person to see his or her full image?
By walking at 34 th of his usual speed, a man reaches office 20 minutes later than usual. What is the usual time he takes to reach office?