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: a 200 meter long train crosses a platform in 50 seconds while it crosses a signal pole in 42 seconds . what is the length of the platform ?
Options: a ) 39.9 , b ) 37.88 , c ) 35 , d ) 38.88 , e ) 38.09
A:
e