Pipes and Cisterns Practice Test 1 with solutions

Question : 11 of 40

Marks: +1, -0

Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes and 10 minutes respectively. When the tank is empty, all the three pipes are opened. A, B and C are filled with the chemical solutions P, Q, R respectively. What is the proportion of solution R in the solutions in the tank after 3 minutes?

$8/{11}$
$7/{11}$
$6/{11}$
$5/{11}$

Validate

Solution:

In 3 minutes the part filled by three pipes =

3 (1/{30}+1/{20}+1/{10})

{11}/{20}

In 3 minutes the part filled by C alone = 3 ×

1/{10}

3/{10}

Required proportion =

{3/{10}}/{{11}/{20}}

3/{10} × {20}/{11}

6/{11}

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