Answer:
4.5/1
Explanation:
First, I found that 10 was the first factor or whatever I could find, so our new ratio is:
9/2
This is obviously not the unit rate, but if we divide by 2 we get:
So our unit rate is 4.5/1
The unit rate is 4.5 days per trip
So the equation would be 90 divided by 20
Simplified it is the same thing as 9 divided by 2
90 divided by 20 is 4.5
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