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'.

[EX Q]: Problem: a can do a piece of work in 80 days and b in 100 days . they work together for 20 days and then b goes away . in how many days will a finish the remaining work ? 
Options: a ) 33 days , b ) 44 days , c ) 55 days , d ) 42 days , e ) 32 days
[EX A]: b

[EX Q]: Problem: a 600 meter long train crosses a signal post in 15 seconds . how long will it take to cross a 3 kilometer long bridge , at the same speed ? 
Options: a ) 4 min , b ) 2 min , c ) 8 min , d ) 9 min , e ) 1.5 min
[EX A]: e

[EX Q]: Problem: if 4 men can colour 48 m long cloth in 2 days , then 6 men can colour 36 m long cloth in 
Options: a ) 1 day , b ) 2 days , c ) 3 days , d ) 4 days , e ) 5 days
[EX A]:
a