RRB RPF RPSF SI and CONS Model Papers 4 with solutions

Question : 14 of 122

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?

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

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 infilling

1/3

rd part will be

8/3

hours

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