Question 5
Mother walks around a lake, completing one lap in 12 minutes. Bình roller-skates in the same direction and overtakes her every 18 minutes. If Bình instead skates in the opposite direction, how many minutes elapse between consecutive meetings?
Model clarification: both keep constant speeds, and Bình's skating speed is unchanged when reversing direction.
Model clarification: both keep constant speeds, and Bình's skating speed is unchanged when reversing direction.