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Model Paper 5 — Applied Maths STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceApplied MathsModel Paper 51 Mark
MCQ
A pipe can fill a tank in $n_1$ hours and another pipe can empty it in $n_2\left(n_2>n_1\right)$ hours. If both the pipes are opened together, the tank will be filled in
  • A
    $\left( n _1- n _2\right)$ hours
  • ✓
    $\frac{n_1 n_2}{n_2-n_1}$ hours
  • C
    $\frac{n_1 n_2}{n_1+n_1}$ hours
  • D
    $\frac{n_1 n_2}{n_1-n_2}$ hours
✓

Answer

Correct option: B.
$\frac{n_1 n_2}{n_2-n_1}$ hours
(b) $\frac{n_1 n_2}{n_2-n_1}$ hours
Explanation: $\frac{n_1 n_2}{n_2-n_1}$ hours

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