Answer:
Jimmy reads 0.5 hours.
Step-by-step explanation:
Given:
Number of hours read by Laura = 2 hours
Now Given:
Conner read twice as long as Laura.
So we can say that;
Number of hours read by corner will equal to 2 times Number of hours read by Laura.
framing in equation form we get;
Number of hours read by corner = 
Also Given:
Heather read only one- forth the time that of Conner.
So we can say that;
Number of hours read by heather will be equal to
times Number of hours read by Corner.
framing in equation form we get;
Number of hours read by Heather = 
Again Given:
Jimmy read half the amount of time that heather read.
So we can say that;
Number of hours read by Jimmy will be equal to
times Number of hours read by Heather.
framing in equation form we get;
Number of hours read by Jimmy = 
Hence Jimmy reads 0.5 hours.