There are two pipes A and B. If A filled 10 liters in an hour, B can fill 20 liters in same time. Likewise B can fill 10, 20, 40, 80, 160. If B filled 1/16 of a tank in 3 hours, how much time will it take to fill the tank completely?
a) 9 B) 8 c) 7 d) 6

• 1/16 in 3 hours
  1/8 in 4 hours,as here rate of water filling is doubled
  1/4 in 5 hours
  1/2 in 6 hours
  1 in 7 hours
  ans will be 7 hours
  
• 13 years agoHelpfull: Yes(29) No(2)
• as rate of filling water of B doubles in an hour
  so, 1/16 in 3 hrs
  2*1/16 in 4 hrs
  2* 1/8 in 5 hrs
  2*1/4 in 6 hrs
  2*1/2=1 in 7 hrs
  so ans is 7 hrs.
• 10 years agoHelpfull: Yes(1) No(0)
• ans is 7 hours
• 10 years agoHelpfull: Yes(0) No(0)
• let full tank contains x ltr.now as it is a g.p series..after 3 hours the part of tank full t21=10.2^2=40 ltr..
  now we can see x/16=40 =>x=40*16..now let it tank n hours to fill the tank completely..so
  x=40*16=10.2^n-1
  =>10.2^2.2^4=10.2^n-1
  =>n-1=6
  =>n=6+1=7
• 10 years agoHelpfull: Yes(0) No(0)