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 man can row upstream at 26 kmph and downstream at 30 kmph , and then find the speed of the man in still water ? 
Options: a ) 29 , b ) 28 , c ) 30 , d ) 32 , e ) 23
[EX A]: b

[EX Q]: Problem: a certain bacteria colony doubles in size every day for 20 days , at which point it reaches the limit of its habitat and can no longer grow . if two bacteria colonies start growing simultaneously , how many days will it take them to reach the habitat ’ s limit ? 
Options: a ) 6.33 , b ) 7.5 , c ) 10 , d ) 15 , e ) 19
[EX A]: e

[EX Q]: Problem: how many minutes does aditya take to cover a distance of 400 m , if he runs at a speed of 20 km / hr 
Options: a ) 115 min , b ) 215 min , c ) 315 min , d ) 415 min , e ) none of these
[EX A]:
a