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

• 
  As per the ques B is doubling its rate every hr so if 1/16th on 3 hrs
  on 4th 1/8th
  on 5th 1/4th
  on 6th 1/2 and
  on 7th hr B will fill it
• 13 years agoHelpfull: Yes(17) No(0)