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: a train passes a station platform in 20 sec and a man standing on the platform in 12 sec . if the speed of the train is 72 km / hr . what is the length of the platform ?
Options: a ) 227 , b ) 140 , c ) 160 , d ) 120 , e ) 171
c

Problem: if 21 lines are drawn in a plane such that no two of them are parallel and no three are concurrent , then in how many points do they intersect ?
Options: a ) 150 , b ) 170 , c ) 190 , d ) 210 , e ) 230
d

Problem: a train running at the speed of 60 km / hr crosses a pole in 15 seconds . what is the length of the train ?
Options: a ) 187 m , b ) 250 m , c ) 876 m , d ) 150 m , e ) 267 m
b