Question

How many kilometres is 1.7 miles?

Answer 1

Hint: Mile is a unit of distance commonly equal to 5,280 feet. $1mile = 1.609344km$.
and Kilometre is unit of length, $1km = 1000m$. A mile can be written as mi and kilometre can be written as km.

Complete step by step answer:
Here we have to convert 1.7 miles into kilometres.
We know, $1mile = 1.609344\,km$
Values in kilometres $ = $ Values in miles $ \times 1.609344$
So, multiply $1.7\,miles$ by $1.609344\,km$
$ \Rightarrow 1.7\,miles = 1.7 \times 1.609344\,km$
$ \Rightarrow 2.7358848\,km$
We can take upto 2 decimal or 3 decimal.
$ \Rightarrow 2.73$ km
Thus, 2.73 km is 1.7 miles.

Additional information:
We can also double-check or convert the obtained answer i.e., km into mi by the conversion factor.
Suppose, converting 2.73 km into miles.
We know, $1\,mile = 1.609344\,km$
So, $1\,km = \dfrac{1}{{1.60934}}\,mi$
So, divide 2.73 km by 1.60934
Or you can say $2.73 \times \dfrac{1}{{1.609344}}$
$ \Rightarrow \dfrac{{2.73}}{{1.609344}}$
$ \Rightarrow $$2.73 \div 1.609344$
$ \Rightarrow 1.6963$ mi
$ \Rightarrow 1.7$ mi
This implies our answer is correct.

Note: Don’t forget to write units after every conversion like km,mi,m etc.
When converting a larger unit like a mile to smaller unit like kilometre, one has to just multiply.
Like Values in kilometres $ = $ Values in miles $ \times 1.609344$
This will imply for other units also. For example, converting a larger unit like kilometre into a metre,
Values in metres= Values in kilometres $ \times 1000$
As $1\,km = 1000\,m$
And when converting a smaller unit like kilometre into the larger unit like miles, one has to divide.
Whatever value of km is given divides it by 1.609344.
Likewise, when converting a smaller unit like metre into kilometre, divide it by 1000.