There are two pipes A and B.If A filled 10 liters in hour B can fills 20 liters in same time.likewise B can fill 10,20,40,80,160.... if B filled in (1/16)th of a tank in 3 hours.how much time will it take to fill completely?  Choose the correct option:
A) 7 hours B) 6 hours C) 5 hours D) 8 hours E) 9 hours
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   7 hoursNSWER:7 hours
<result>A</result>
There are two pipes A and B.If A filled 10 liters in hour B can fills 20 liters in same time.likewise B can fill 10,20,40,80,160.... if B filled in (1/16)th of a tank in 3 hours.how much time will it take to fill completely?