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 Q]: Problem: a can finish a work in 20 days , b in 15 days and c in 12 days . b and c start the work but are forced to leave after 2 days . the remaining work was done by a in : 
Options: a ) 10 , b ) 11 , c ) 12 , d ) 13 , e ) 14
[EX A]: e

[EX Q]: Problem: 9 spheres of the same size are made from melting a solid cylinder of 16 cm diameter and 12 cm height . what is the diameter of each sphere ? 
Options: ['a ) 4 cm', 'b ) 6 cm', 'c ) 8 cm', 'd ) 10 cm', 'e ) 12 cm']
[EX A]: c

[EX Q]: Problem: find avrg speed if a man travels at speed of 15 km / hr up and 28 km / hr dawn at an altitude of 230 m . 
Options: a ) 25.8 , b ) 19.5 , c ) 18.0 , d ) 12.2 , e ) 29.8
[EX A]:
b