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 , b , k start from the same place and travel in the same direction at speeds of 30 km / hr , 40 km / hr , 50 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 ) 2.4 , b ) 3.2 , c ) 4.0 , d ) 4.8 , e ) 5.6
[A]: b


[Q]: Problem: if 22 men do a work in 55 days , in how many days will 10 men do it ? 
Options: a ) 121 , b ) 123 , c ) 119 , d ) 125 , e ) 127
[A]: a


[Q]: Problem: a brick measures 20 cm * 10 cm * 7.5 cm how many bricks will be required for a wall 24 m * 2 m * 0.75 m ? 
Options: a ) 29798 , b ) 27908 , c ) 24000 , d ) 25000 , e ) 27991
[A]:
c