water is filled in cylindrical vessel in such a way that its volume doubles after every 5 minute .if it takes 30 minute for the vessel to be full than the vessel will be one fourth full in

(a)20 min
(b)25 min
(c)7 min 30 sec.
(d)10 min.

• (a) 20 min.
  
  It was 1/2 full by 30-5=25 min. So 1/4 full was by 25-5=20 min.
• 9 years agoHelpfull: Yes(1) No(1)