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 many seconds will a train 250 meters long take to cross a platform 200 meters long if the speed of the train is 90 kmph ? 
Options: a ) 18 sec , b ) 15 sec , c ) 21 sec , d ) 16 sec , e ) 20 sec
[EX A]: a

[EX Q]: Problem: if the wheel is 28 cm then the number of revolutions to cover a distance of 1056 cm is ? 
Options: a ) 3 , b ) 5 , c ) 26 , d ) 12 , e ) 6
[EX A]: e

[EX Q]: Problem: two trains running in opposite directions cross a man standing on the platform in 67 seconds and 17 seconds respectively and they cross each other in 73 seconds . the ratio of their speeds is : 
Options: a ) 3 / 2 , b ) 3 / 9 , c ) 3 / 6 , d ) 3 / 1 , e ) 3 / 5
[EX A]:
a