RRB Group D 27-Sep-2018 Shift 1 Solved Paper

Question : 20 of 100

Marks: +1, -0

A water tank is

{2}/{5}

th full. Inlet A can fill the tank in 12 minutes while an outlet pipe

{B}

can empty it in 6 minutes. If both the pipes are open. How long will it take to empty or fill the tank completely?

Solution:

tank will be empty, if both the pipes are open together.

{1}/{12}-{1}/{6}={1-2}/{12}=-{1}/{12}=12

minutes

{2^{\th}}/{5}

of the tank will be empty in

=12 ×{2}/{5}={24}/{5}=4.8 \ {\min}

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