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'.

Example 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
Example Output: c

Example Input: Problem: two trains , one from howrah to patna and the other from patna to howrah , start simultaneously . after they meet , the trains reach their destinations after 49 hours and 25 hours respectively . the ratio of their speeds is ? 
Options: a ) 4 : 9 , b ) 5 : 7 , c ) 4 : 5 , d ) 4 : 1 , e ) 4 : 2
Example Output: b

Example Input: Problem: a train 125 m long passes a man , running at 6 km / hr in the same direction in which the train is going , in 10 sec . the speed of the train is ? 
Options: a ) 40 , b ) 50 , c ) 51 , d ) 79 , e ) 80
Example Output:
c