John read half of the time that Tom read. Tom read that half of the time Sasha read. Sasha read twise as long as Mike. If Mike read 6 hours, how long did John read?
Mike read 6 hours. Sasha doubled the reading time so 3*2=12. Tom read half of that time, so it is the same as Mike which is 3. John read half of Tom's time, so 6 divided by 2 is 3.
