SSC CGL Tier II 25 Oct 2015 Paper 1

Question : 16 of 100

Marks: +1, -0

Pipe A can fill an empty tank in 6 hours and pipe B in 8 hours. If both the pipes are opened and after 2 hours pipe. A is closed, how much time B will take to fill the remaining tank?

$7 1/ 2$ hours
$2 2/ 5$ hours
$2 1/3$ hours
$3 1 /3$ hours

Validate

Solution:

(4) Part of tank filled by pipes A and B in 2 hours

=2 ( {1}/{6}+ {1}/{8} )

=2 ( {4+3}/{24} )= {7}/{12}

Remaining part

=1- {7}/{12}= {5}/{12}

This part is filled by pipe B.

∴

Required time

= {5}/{12} × 8

= {10}/{3}

hours

=3 {1}/{3}

hours

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