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'.

Input: Consider Input: Problem: a 300 m long train crosses a platform in 45 sec while it crosses a signal pole in 18 sec . what is the length of the platform ? 
Options: a ) 287 , b ) 350 , c ) 828 , d ) 450 , e ) 122

Output: d


Input: Consider Input: Problem: a train is 360 meter long is running at a speed of 45 km / hour . in what time will it pass a bridge of 140 meter length . 
Options: a ) 20 seconds , b ) 27 seconds , c ) 30 seconds , d ) 40 seconds , e ) 50 seconds

Output: d


Input: Consider Input: Problem: if the population of a certain country increases at the rate of one person every 30 seconds , by how many persons does the population increase in 1 hour ? 
Options: a ) 100 , b ) 120 , c ) 150 , d ) 180 , e ) 160


Output: b