How do you convert \[35{mi}/{h}\;\]to\[{km}/{h}\;\]?

Hint: The question is based on the concept of the unit conversion method. There are 3 other unit systems other than SI units. 1 mile equals 1.60934 km and 1 hour equals 1 hour. So, using this value we will convert miles per hour into km per hour.

Complete answer:
From the given information, we have the data as follows.
The given data represents either speed or velocity. We are asked to convert the unit from miles per hour to km per hour.
This data represents 2 parameters, that is, the distance and the time taken. The distance is given in terms of the miles and we are asked to convert it into km. The time taken is given in terms of hours in both the units and there is no need to change this unit.
Firstly we will perform the unit conversion from miles to km. so, we have,
1 mile equals 1.60934 km.
Thus we can write as 1 mile per hour equals 1.60934 km per hour.
We are asked to convert 35 miles per hour into km per hour, so, we have to multiply both the sides by 35, thus, we get,
\[\begin{align}
  & 35\times 1{mi}/{hr}\;=35\times 1.60934\,{km}/{hr}\; \\
 & \therefore 35{mi}/{hr}\;=56.3269\,{km}/{hr}\; \\
\end{align}\]
\[\therefore \]The conversion of 35 miles per hour into km per hour equals 56.3269 km per hour.

Additional information:
There are a total of 4 unit systems, they are: SI units, MKS system, FPS system and CGS system of units.


Note:
Every time, we won’t be asked to convert the units to SI units, for example, in this question, we are asked to convert the unit into km per hr, neither the unit of distance is in SI unit nor the unit of the time is in SI unit.