Petya left school at 4:50 PM and arrived home at 4:10 PM. How long did it take him to get home?

Solution:

• To find the time Petya spent getting home, we need to subtract the time he left school from the time he arrived home.
• Time of arrival: 16:10
• Time of departure: 15:40
• Subtracting 15:40 from 16:10:
• From 15:40 to 16:00 is 20 minutes.
• From 16:00 to 16:10 is 10 minutes.
• Total time = 20 minutes + 10 minutes = 30 minutes.

Answer: 30 minutes