In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Ex Input:
Problem: a car left town a towards town b driving at a speed of v = 32 km / hr . after 3 hours on the road the driver stopped for 15 min in town c . because of a closed road he had to change his route , making the trip 28 km longer . he increased his speed to v = 40 km / hr but still he was 30 min late . find the distance the car has covered . 
Options: a ) 114 , b ) 115 , c ) 116 , d ) 117 , e ) 118

Ex Output:
c


Ex Input:
Problem: a train 110 meters long completely crosses a 280 meters long bridge in 38 seconds . what is the speed of the train is ? 
Options: a ) 32 , b ) 45 , c ) 40 , d ) 66 , e ) 09

Ex Output:
c


Ex Input:
Problem: in traveling from a dormitory to a certain city , a student went 1 / 4 of the way by foot , 1 / 2 of the way by bus , and the remaining 10 kilometers by car . what is the distance , in kilometers , from the dormitory to the city ? 
Options: a ) 10 , b ) 45 , c ) 30 , d ) 20 , e ) 40

Ex Output:

e