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: two trains 140 m and 160 m long run at the speed of 60 km / hr and 40 km / hr respectively in opposite directions on parallel tracks . the time ( in seconds ) which they take to cross each other , is :
Options: a ) 9 , b ) 9.6 , c ) 10 , d ) 10.8 , e ) 7
[A]: d

[Q]: Problem: what is the maximum number of pieces of birthday cake of size 5 " by 5 " that can be cut from a cake 15 " by 15 " ?
Options: a ) 5 , b ) 10 , c ) 16 , d ) 20 , e ) 9
[A]: e

[Q]: Problem: 3 different containers contain 496 litres , 403 litres and 713 litres of mixtures of milk and water respectively . what biggest measure can measure all the different quantities exactly ?
Options: a ) 30 litres , b ) 31 litres , c ) 32 litres , d ) 33 litres , e ) 34 litres
[A]:
b