Step by step
The question
Question: 195 miles in 3 hours.
How many miles in 1 hour?
A unit rate tells us how much for just 1.
Here: miles for 1 hour.
There are four choices.
First we solve it, the normal way.
Then we pick.
1 Write it as a fraction
We write it as a fraction.
The miles go on top.
The hours go on the bottom.
2 Divide to get 1 at the bottom
We want 1 hour on the bottom.
3 divided by 3 is 1.
We divide the top by 3 too, so the rate stays the same.
195 divided by 3 is 65.
So it is 65 miles for 1 hour.
Per means for each.
So the unit rate is 65 miles per hour.
3 Check
Let's check: 3 hours at 65 miles per hour.
3 times 65 is 195.
That is 195 miles, so it is right!
4 Pick the choice
Our answer is 65 miles per hour.
That is choice A.
5 Why not the others
B is 192.
Wrong: took away 3 instead of dividing by 3.
C is 198.
Wrong: added 3 instead of dividing by 3.
D is 585.
Wrong: multiplied by 3 instead of dividing.
Let's look back.
First: write it as a fraction.
Then: divide to get 1 at the bottom.
Then: check.
Then: pick the choice.
Last: why not the others.