RRB Group D 23-Oct-2018 Shift 3 Solved Paper

Question : 50 of 100

Marks: +1, -0

Two pipes

{A}

and

{B}

can fill an empty cistern in 4.8 and 7.2 hours, respectively. Pipe C can drain the entire cistern in 9.6 hours when no other pipe is in operation. Inititally when the cistern was empty, pipe A and pipe C were turned on. After a few hours, Pipe A was turned off and Pipe B was turned on instantly. In all it took 16.8 hours to fill the cistern. For how many hours was Pipe B turned on?

10.8
11.55
10.5
12.6

Validate

Solution:

(6-3) x+(4-3)(16.8-x)

=28.8

3 x+16.8-x=28.8

2 x=28.8-16.8

2 x=12

x=6

Pipe

{B}

was turned on for

=16.8-6

=10.8

hours.

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