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A tank has 3 inlets X, Y and Z and 1 outlet. P, Y fills the empty tank in 3 times the time taken by Z to fill the empty tank completely. X fills the empty tank completely in 1.5 times the time taken by Y to fill the empty tank completely. Also, Z fills the empty tank completely in half the time taken by P to empty the full tank completely. If the time taken to fill the empty tank completely when all of them are opened simultaneously is \( \Large 3 \frac{15}{19} \) hours. how much time (in hours) will P take to empty the full tank completely ?
A) \( \Large 6 \frac{1}{2} \)
B) 6
C) 8
D) 4
Correct answer:
C) 8
Description for Correct answer:
Let time taken by pipe Z in filling the empty tank = x hours
\( \Large \therefore \) Time taken by Y = 3x hours
\( \Large \therefore \) Time taken by X
=> \( \Large (\frac{3}{2} \times 3x) \ hours \)
= \( \Large \frac{9x}{2} \ hours \)
Time taken by P in emptying the full tank = 2x hours
According to the question,
\( \Large \frac{1}{x} + \frac{1}{3x} + \frac{2}{9x} - \frac{1}{2x} = \frac{19}{72} \)
=> \( \Large \frac{18 + 6 + 4 - 9}{18x} = \frac{19}{72} \)
=> \( \Large \frac{19}{18x} = \frac{19}{72} => 18x = 72 \)
=> \( \Large x = \frac{72}{18} = 4 \ hours \)
\( \Large \therefore \) Time taken by P in emptying the tank = 8 hours
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