instruction:
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'.
question:
Problem: in traveling from a dormitory to a certain city , a student went 1 / 5 of the way by foot , 2 / 3 of the way by bus , and the remaining 4 kilometers by car . what is the distance , in kilometers , from the dormitory to the city ? 
Options: a ) 30 , b ) 45 , c ) 60 , d ) 90 , e ) 120
answer:
a


question:
Problem: a train passes a station platform in 20 sec and a man standing on the platform in 12 sec . if the speed of the train is 72 km / hr . what is the length of the platform ? 
Options: a ) 227 , b ) 140 , c ) 160 , d ) 120 , e ) 171
answer:
c


question:
Problem: an woman sitting in a train which is travelling at 25 kmph observes that a goods train travelling in a opposite direction , takes 3 seconds to pass him . if the goods train is 140 m long , find its speed . 
Options: a ) 141 , b ) 142 , c ) 143 , d ) 144 , e ) 145
answer:

c