Task: Question Answering
Input (English): Problem: the diameter of the driving wheel of a bus in 140 cm . how many revolutions per minute must the wheel make in order to keep a speed of 24 kmph ? 
Options: a ) 21.21 , b ) 22.26 , c ) 90.9 , d ) 24.86 , e ) 25.25
Output (English): c