Task: Question Answering
Input (English): Problem: a motorcyclist goes from nagpur to pune , a distance of 500 kms at an average of 100 kmph speed . another man starts from nagpur by car 3 â ½ hours after the first , and reaches pune â ½ hour earlier . what is the ratio of the speed of the motorcycle and the car ? 
Options: a ) 1 : 2 , b ) 1 : 7 , c ) 3 : 5 , d ) 1 : 5 , e ) 1 : 1
Output (English): c