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: a car traveling at a certain constant speed takes 10 seconds longer to travel 1 km than it would take to travel 1 km at 80 km / hour . at what speed , in km / hr , is the car traveling ? 
Options: a ) 70 , b ) 72 , c ) 74 , d ) 65 , e ) 78
[EX A]: d

[EX Q]: Problem: the length of the bridge , which a train 140 metres long and travelling at 45 km / hr can cross in 30 seconds , is ? 
Options: a ) 255 , b ) 267 , c ) 235 , d ) 277 , e ) 211
[EX A]: c

[EX Q]: Problem: on my sister ' s birthday , she was 143 cm in height , having grown 10 % since the year before . how tall was she the previous year ? 
Options: a ) 140 cm , b ) 136 cm , c ) 130 cm , d ) 127 cm , e ) 125 cm
[EX A]:
c