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: Problem: walking at 5 / 6 th of its usual speed a cab is 15 mnts late . find its usual time to cover the journey ? 
Options: a ) 25 m , b ) 45 m , c ) 32 m , d ) 75 m , e ) 62 m
Example solution: d
Example explanation: New speed = 5 / 6 th of usual speed new time = 6 / 5 th of usual time 6 / 5 ut - ut = 15 m ut / 5 = 15 m ut = 75 m answer is d

Problem: Problem: a and b can do a piece of work in 10 days , b and c in 5 days , c and a in 15 days . how long will c take to do it ? 
Options: a ) 77 days , b ) 55 days , c ) 12 days , d ) 33 days , e ) 11 days

Solution: c