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 train takes 10 sec to pass a signal post and covers a distance of 10 km in 15 min . find the length of train ?
Options: a ) 100.1 m , b ) 223.1 m , c ) 111.1 m , d ) 120.3 m , e ) 133.4 m
[A]: c

[Q]: Problem: a , b , k start from the same place and travel in the same direction at speeds of 30 km / hr , 40 km / hr , 80 km / hr respectively . b starts two hours after a . if b and k overtake a at the same instant , how many hours after a did k start ?
Options: a ) 2 , b ) 3 , c ) 4 , d ) 5 , e ) 6
[A]: d

[Q]: Problem: walking at 6 / 7 th of his usual speed , a man is 25 mins too late . his usual time is
Options: a ) 7.5 hrs , b ) 1.5 hrs , c ) 2.5 hrs , d ) 1.67 hrs , e ) 2.67 hrs
[A]:
c