Answer the following question
Write as decimal : $41 km 9 m$

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Solution

$\begin{array}{rcl} 41 km 9 m & = & 41 km + 9 m \\ = & 41 km + 9 \times 1 m \\ = & 41 km + 9 (\frac{1}{1000}) km [∵ 1 m = \frac{1}{1000} km] \\ = & 41 km + 0 \cdot 009 km \\ = & 41 \cdot 009 km \end{array}$
Hence, $41 km 9 m = 41.009 km$

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