TASK DEFINITION: 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'.
PROBLEM: Problem: a and b can do a work in 12 days , b and c in 15 days , c and a in 20 days . if a , b and c work together , they will complete the work in : 
Options: a ) 5 days , b ) 7 5 / 6 days , c ) 10 days , d ) 15 2 / 3 days , e ) none of these

SOLUTION: c

PROBLEM: Problem: if a train , travelling at a speed of 180 kmph , crosses a pole in 5 sec , then the length of train is ? 
Options: a ) 250 m , b ) 112 m , c ) 117 m , d ) 125 m , e ) 123 m

SOLUTION: a

PROBLEM: Problem: x is 3 times as fast as y and working together , they can complete a work in 20 days . in how many days can y alone complete the work ? 
Options: a ) 11 days , b ) 80 days , c ) 13 days , d ) 15 days , e ) 19 days

SOLUTION:
b