8RB Group D 23-Sep-2018 Shift 1 Solved Paper

Question : 29 of 100

Marks: +1, -0

Pipes A and C can fill an empty cistern in 7 and 10.5 hours, respectively while Pipe

{B}

can drain the filled cistern in 5.25 hours. If the three pipes are turned on together when the cistern is empty, how many hours will it take for the cistern tobe

{2}/{3}

full?

21
12
14
15.75

Validate

Solution:

[({1}/{7}+{1}/{10.5})-{1}/{5.25}]

tank fill in one hour

=0.14+0.09-0.19=0.0476

Time to fill the cistern full

={1}/{0.0476}

=21 {hrs}

Time to fill

{2}/{3}

of cistern

={21 \×2}/{3}

=14 \ {hrs}

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