Question

A nascar racecar can attain speeds of over 225 miles/hour on super speedways. How fast is this in km/hr

Answer 1

It is 362.102 km/hr

Answer 2

The correct answer is
`362.32 (km)/(hour)`

Step-by-step explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other, the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

A ⇒ B

C ⇒ x

So
`x=(C*B)/(A)`

The direct rule of three is the rule applied in this case where there is a change of units. To perform this conversion of units, you must first know that 1km = 0.621 miles. So, if 1 km is 0.621 miles, how many kilometers equals 225 miles?

`x kilometers=(225 miles*1 km)/(0.621 miles)`

`x kilometers=362.32 kilometers`

So, finally,

`225 (miles)/(hour) =362.32 (miles)/(hour)`