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**Hint**: We first find the relation between mile and kilometre. The measurement is common in measurement units. We find the relation as 1 mile being equal to $ 1.60934 $ kilometres. We use the unitary system, to find the length of the $ 1.7 $ miles in Km.

**:**

__Complete step-by-step answer__We need to convert the length by changing its unit from mile to kilometre.

We find the relation between mile and kilometre where 1 mile is equal to $ 1.60934 $ kilometres.

We already have that in the unitary system. The unitary method is a method in which we find the value of a unit and then the value of a required number of units. The unitary method is also used to find the value of a single unit from a given multiple.

We need the equivalent length of $ 1.7 $ miles.

We multiply $ 1.7 $ with $ 1.60934 $ to get the length which will be equal to $ 1.7 $ miles.

Therefore, $ 1.7 $ miles are equal to $ 1.7\times 1.60934=\text{2}\text{.735878} $ Km.

Therefore, $ 1.7 $ miles are equivalent to $ \text{2}\text{.735878} $ kilometres.

**So, the correct answer is “2.735878 Km”.**

**Note**: The mile and kilometre are units of measurement for long distance in both the US customary units and the metric systems of measurement. This unit is used in the normal or common measurement units. It can also be changed to other common measurement units using the relation in the metric system.

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