RRB Group D 2-Nov-2014 Shift 1 Solved Paper

Question : 28 of 100

Marks: +1, -0

Two pipes A and B can fill a tank in 20 minutes and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

12 minutes
15 minutes
25 minutes
50 minutes

Validate

Solution:

Work done by pipes

A

and

B

in one day

=\;{1}/{20}+\;{1}/{30}=\;{3+2}/{60}=\;{5}/{60}=\;{1}/{12}

Time taken by both the pipes to fill the tank completely

=12

minutes.

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