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 180 meter long train crosses a man standing on the platform in 9 sec . what is the speed of the train ? 
Options: a ) 72 , b ) 108 , c ) 1266 , d ) 188 , e ) 211
[EX A]: a

[EX Q]: Problem: a cyclist bikes x distance at 8 miles per hour and returns over the same path at 10 miles per hour . what is the cyclist ' s average rate for the round trip in miles per hour ? 
Options: a ) 8.1 , b ) 8.9 , c ) 8.6 , d ) 8.3 , e ) 9.0
[EX A]: b

[EX Q]: Problem: 1000 men have provisions for 17 days . if 500 more men join them , for how many days will the provisions last now ? 
Options: a ) 12.9 , b ) 12.5 , c ) 11.3 , d ) 12.2 , e ) 12.1
[EX A]:
c