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'.

[Q]: Problem: a 180 meter long train crosses a man standing on the platform in 9 sec . what is the speed of the train ? 
Options: a ) 72 , b ) 108 , c ) 1266 , d ) 188 , e ) 211
[A]: a


[Q]: Problem: a and b can do a work in 25 days and 10 days respectively . a starts the work and b joins him after 2 days . in how many days can they complete the remaining work ? 
Options: a ) 4.28 days , b ) 4.38 days , c ) 5.28 days , d ) 6.28 days , e ) 2.28 days
[A]: a


[Q]: Problem: a and b complete a work in 80 days . a alone can do it in 40 days . if both together can do the work in how many days ? 
Options: a ) 1.0875 days , b ) 0.1875 days , c ) 0.0675 days , d ) 0.0375 days , e ) 0.0775 days
[A]:
d