Detailed Instructions: In this task, you need to provide the correct option for a given problem from the provided options.
Q: Problem: susan finds that she spends her free time during summer vacation between swimming , reading , and hanging out with friends in a ratio of 1 : 4 : 10 . how many hours did she spend reading if she hung out with her friends for 20 hours ?
Options: a ) 2 , b ) 4 , c ) 5 , d ) 8 , e ) 10
A:
d