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: find the length of the longest pole that can be placed in an indoor stadium 24 m long , 18 m wide and 16 m high 
Options: a ) 31 , b ) 32 , c ) 33 , d ) 34 , e ) 35
Example Output: d

Example Input: Problem: two cars a and b start from boston and new york respectively simultaneously and travel towards each other at constant speeds along the same route . after meeting at a point between boston and new york the two cars a and b proceed to their respective destinations of new york and boston . car a reaches new york 10 minutes after the two cars have met and car b reaches boston 90 minutes after they have met . how long did car a take to cover the distance between boston and new york ? 
Options: a ) 1 hour , b ) 1 hour 10 minutes , c ) 2 hours 30 minutes , d ) 50 minutes , e ) 2 hours 10 minutes
Example Output: d

Example Input: Problem: a train crosses a platform of 120 m in 15 sec , same train crosses another platform of length 180 m in 18 sec . then find the length of the train ? 
Options: a ) 145 , b ) 180 , c ) 181 , d ) 184 , e ) 150
Example Output:
b