Answer:
Ivan took 17/8 hours longer to clean the kitchen
Step-by-step explanation:
The time it took Ivan too long, would be the difference between the time he took to clean the kitchen by the time he took to clean his bedroom.
Then,
[tex]2\frac{1}{2}-\frac{3}{8}=\frac{17}{8}[/tex]Ivan took 17/8 hours longer to clean the kitchen
