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: an outlet pipe empties a tank which is full in 5 hours . if the inlet pipe is kept open , which lets water in at the rate of 8 litres / min then outlet pipe would take 3 hours longer . find the capacity of the tank . 
Options: a ) 8600 litres , b ) 200 litres , c ) 12800 litres , d ) 6400 litres , e ) 13200 litres
[EX A]: d

[EX Q]: Problem: the sector of a circle has radius of 21 cm and central angle 180 o . find its perimeter ? 
Options: a ) 91.5 , b ) 92 , c ) 108 , d ) 94 , e ) 95
[EX A]: c

[EX Q]: Problem: a man can row upstream at 25 kmph and downstream at 39 kmph , and then find the speed of the man in still water ? 
Options: a ) 22 , b ) 37 , c ) 32 , d ) 27 , e ) 18
[EX A]:
c