Answer : Option B
Explanation :
Length of pipe X = 30 meter
Given that pipe X is 45% longer than Y
Let the length of pipe Y = y
$MF#%\begin{align}&\text{Then, Length of pipe X = }y \times \dfrac{\left(100+45\right)}{100}\\
&\Rightarrow 30 = y \times \dfrac{145}{100}
=> y = \dfrac{30 \times 100}{145} = \dfrac{6 \times 100}{29} = \dfrac{600}{29} = 20.68\end{align} $MF#%
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