In this task, you need to provide the correct option for a given problem from the provided options.

[EX Q]: Problem: the ratio between speed of the two trains is 7 : 8 . if the 2 nd train runs 400 km in 4 hrs , what is the speed of the 1 st train ? 
Options: a ) 87.9 , b ) 87.5 , c ) 87.7 , d ) 87.6 , e ) 43.3
[EX A]: b

[EX Q]: Problem: the ratio between the number of sheep and the number of horses at the stewart farm is 2 to 7 , if each horse is fed 230 ounces of horse food per day and the farm needs a total 12,880 ounces of horse food per day , what is the number of sheep in the farm ? 
Options: a ) 18 , b ) 16 , c ) 32 , d ) 56 , e ) 60
[EX A]: b

[EX Q]: Problem: if m = 3 ^ n , what is the greatest value of n for which m is a factor of 31 ! 
Options: a ) 8 , b ) 10 , c ) 12 , d ) 14 , e ) 16
[EX A]:
d