Task: Question Answering
Input (English): Problem: youseff lives x blocks from his office . it takes him 1 minute per block to walk to work and 20 seconds per block to ride his bike to work . it is takes him exactly 8 minutes more to walk to work than to ride his bike to work , then x equals ? 
Options: a ) 4 , b ) 7 , c ) 12 , d ) 15 , e ) 20
Output (English): c