Task: Question Answering
Input (English): Problem: a ' s speed is 20 / 13 times that of b . if a and b run a race , what part of the length of the race should a give b as a head start , so that b beats a by 25 % of the length of the race ? 
Options: a ) 44 % , b ) 48 % , c ) 52 % , d ) 42 % , e ) 61 %
Output (English): e