Task: Question Answering
Input (English): Problem: two dogsled teams raced across a 300 mile course in wyoming . team a finished the course in 3 fewer hours than team r . if team a ' s average speed was 5 mph greater than team r ' s , what was team r ' s average mph ? 
Options: a ) 12 , b ) 15 , c ) 18 , d ) 20 , e ) 25
Output (English): d