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 Input:
Problem: excluding stoppages , the speed of a bus is 58 kmph and including stoppages , it is 40 kmph . for how many minutes does the bus stop per hour ?
Options: a ) 19 , b ) 19.13 , c ) 10.5 , d ) 11.35 , e ) none of these

Ex Output:
a

Ex Input:
Problem: the radius of the wheel of a bus is 70 cms and the speed of the bus is 66 km / h , then the r . p . m . ( revolutions per minutes ) of the wheel is
Options: a ) 200 , b ) 250 , c ) 300 , d ) 330 , e ) none of these

Ex Output:
b

Ex Input:
Problem: if two - third of a bucket is filled in 90 seconds then the time taken to fill the bucket completely will be .
Options: a ) 90 seconds , b ) 70 seconds , c ) 135 seconds , d ) 100 seconds , e ) 120 seconds

Ex Output:
c