Q:

Beginner Logic Puzzle - Web Site Log

I recently began creating my own logic puzzles. I thought I'd share some, from easy to hard here. Here is an easy one to get you warmed up!
Puzzle Information
A group of friends - John, Heather, and Mike decided to log how many hours per week they visited their favorite web site. Based on the clues below, find out who visited what site, and for how long.
Clues

John favorite site is TechCrunch
StackOverflow was visited 7 Hours
Mike visited 5 Hours

Web Sites:

StackOverflow
TechCrunch
W3Schools

People:

John
Heather
Mike

Hours:

Five hours (5)
Seven hours (7)
Ten hours (10)

A:

 Mike visited W3Schools Five HoursJohn visited TechCrunch Ten HoursHeather visited StackOverflow Seven Hours

Because

Mike visited 5 hours, which is not StackOverflow (as for StackOverflow, it's 7 hours). TechCrunch is not Mike's favorite as it's the favorite site of John.

Which yields

Mike visited W3Schools 5 hours

Now

John's favorite site is TechCrunch and time visited on StackOverflow was 7 and for W3Schools was 5.

and it yields

John visited TechCrunch 10 Hours

Now what left is 

Heather visited StackOverflow Seven Hours

