A person goes to bed at shasrp 10.00 pm every day. Is it an example of periodic motion? If yes, what is the time period? If no why?

What are periodic motion? Give any two examples.

Two town A and B are connected by a regular bus service with a bus leaving in either direction every T min. A man cycling with a speed of 20kmh^(-1) in the direction A to B notices that a bus goes past him every 18 min in the direction of his motion, and every 6 min in the opposite direction. What is the period T of the bus service and with what speed do the buses ply of the road?

What is meant by periodic and non-periodic motion ? Give any two examples , for each motion ?