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: how long does a train 165 meters long running at the rate of 54 kmph take to cross a bridge 660 meters in length ? 
Options: a ) 55 sec , b ) 40 sec , c ) 45 sec , d ) 30 sec , e ) 35 sec
[EX A]: a

[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: the radius of a semi circle is 6.6 cm then its perimeter is ? 
Options: a ) 32.7 , b ) 32.4 , c ) 22.4 , d ) 33.9 , e ) 32.1
[EX A]:
d