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'.

Ex Input:
Problem: two trains 140 m and 160 m long run at the speed of 60 kmph and 40 kmph in opposite directions in parallel tracks . the time which they take to cross each other is ? 
Options: a ) 5.6 sec , b ) 8.9 sec , c ) 10.8 sec , d ) 12.6 sec , e ) 15 sec

Ex Output:
c


Ex Input:
Problem: ajay can walk 6 km in 1 hour . in how many hours he can walk 70 km ? 
Options: a ) 5 hrs , b ) 11.6 hrs , c ) 15.6 hrs , d ) 20.1 hrs , e ) 30 hrs

Ex Output:
b


Ex Input:
Problem: three cubes of metal whose edges are 5 , 10 and 15 cm respectively , are melted and one new cube is made . find the edge of the new cube ? 
Options: a ) 28 , b ) 77 , c ) 66 , d ) 16.5 , e ) 99

Ex Output:

d