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 cistern is normally filled in 10 hrs , but takes 2 hrs longer to fill because of a leak on its bottom , if cistern is full , how much time citern would empty ? 
Options: a ) 10 hours , b ) 20 hours , c ) 60 hours , d ) 40 hours , e ) 50 hours

Output: c


Input: Consider Input: Problem: two passenger trains start at the same hour in the day from two different stations and move towards each other at the rate of 14 kmph and 21 kmph respectively . when they meet , it is found that one train has traveled 60 km more than the other one . the distance between the two stations is ? 
Options: a ) 477 , b ) 420 , c ) 279 , d ) 276 , e ) 291

Output: b


Input: Consider Input: Problem: 16 boys or 24 girls can construct the wall in 6 days . the number of days that 8 boys and 12 girls will take to construct ? 
Options: a ) 7 days , b ) 14 days , c ) 6 days , d ) 8 days , e ) 9 days


Output: c