You will be given a definition of a task first, then some input of the task.
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'.

Problem: how long does a train 165 meters long running at the rate of 72 kmph take to cross a bridge 660 meters in length ? 
Options: a ) 28 , b ) 41.25 , c ) 55 , d ) 18 , e ) 12
Output:
b