Clock Puzzles - General Questions

A clock strikes once at 1 o'clock, twice at 2 o'clock, and so on. How many times does it strike from 1 o'clock to 5 o'clock (inclusive)?

A clock gains 4 minutes every hour. It is set right at 12 noon. What time will it show after 12 hours of actual time?

A clock strikes once at 1 o'clock, twice at 2 o'clock, and so on. How many times does it strike from 1 o'clock to 7 o'clock (inclusive)?