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: convert 0.35 in to a vulgar fraction ? 
Options: a ) 18 / 50 , b ) 16 / 50 , c ) 7 / 20 , d ) 19 / 50 , e ) none

A: c
****
Q: Problem: a and b together can do a piece of work in 10 days . b alone can finish it in 20 days . in how many days can a alone finish the work ? 
Options: a ) 20 , b ) 10 , c ) 15 , d ) 5 , e ) 7

A: a
****
Q: Problem: a train 200 m long running at 80 kmph crosses a platform in 22 sec . what is the length of the platform ? 
Options: a ) 338 , b ) 277 , c ) 350 , d ) 288 , e ) 271

A:
d
****