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  1. Two pipes A and B can fill a tank in 6 hours and 8 hours respectively. If both the pipes are opened together, then after how many hours should B be closed so that the tank is full in 4 hours?
    1. 2/3 hrs
    2. 1 hrs
    3. 2 hrs
    4. 8/3 hrs
Correct Option: D

As per the given in question , we have

Part of the tank filled in 4 hours by pipe A =
4
=
2
63

Remaining part = 1 -
2
=
1
33

Time taken by pipe B in filling
1
 part =
8
  hours
33

We can find required answer with the help of given formula :
Here, p = 6,q = 8, t = 4
Required time = q 1 -
t
p

Required time = 8 1 -
4
6

Required time =
8
hours
3



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