RRB Group D Model Paper 2 with solutions

Question : 73 of 100

Marks: +1, -0

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?

$2 /3$ hours
1 hours
2 hours
$8 /3$ hours

Validate

Solution:

(4) Part of tank filled by pipe A in one hour is

1 /6

and that of B is

1/ 8

.
Now, part of tank filled in 4 hours by pipe A =

4 /6=2/3

.
Therefore, time taken by pipe B in filling 1/3rd part will be

8 /3

hours

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