RRB Group D 24-Sep-2018 Shift 1 Solved Paper

Question : 75 of 100

Marks: +1, -0

Two pipes

A

and

B

together can fill a tank in 4 hours. Had they been opened separately, then

{B}

would have taken _______ hours more than A to fill the tank if A alone could fill the tank in 6 hours.

Solution:

{A}+{B}

together can fill a tank

=4 {hrs}

\&

A alone can fill a tank

=6 {hrs}

.
So

{B}

alone can fill the

\tan{k}={1}/{6}-{1}/{4}

={6-4}/{24}={2}/{24}={1}/{12}=12 {hrs}

∴ {B}

would have taken 6 hours more than to A to fill the tank.

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