What is the unit rate for 501.9 mi on 21 hours

The unit rate for this problem would be finding how many miles per hour.

We can simply do this by doing this:

Number of miles
   = Number of miles per hour
Number of hours 

Number of miles: 501.9
Number of hours: 21 hours

                                                 501.9 
 Number of miles per hour =     = 23.9 
                                                    21

The unit rate is 23.9 mi/hr (miles per hour)

To find the unit rate I recommend using this proportion.
509.1mi/1h   21h/x
Or just divide 509.1mi by 21h. The answer would be 24.242857, if you round it to the nearest hundredth it becomes 24.24. Therefore, the answer is 24.24 miles on 1 hour.
Hope this helps, please mark brainliest!

The question is incomplete:

Lisa and Tomas Lopez are buying a new minivan that has a base price of $22,510.the options total $8,062 and destination charge is $770. The dealer's cost is estimated to be 91% of the base price and 88% of the options.

-What is the sticker price of the vehicle?

-Find the dealer's percent of the base price.

-Find the dealer's percent of the options price.

-What is the estimated dealer's cost?

-What is the sticker price of the vehicle? $31,342

-Find the dealer's percent of the base price: $20,484

-Find the dealer's percent of the options price: $7,094

-What is the estimated dealer's cost?  $28,348

Step-by-step explanation:

-The sticker price is the result of adding the base price plus the options plus the destination charge.

Sticker price= base price + options + destination charge

Sticker price= $22,510+$8,062+$770

Sticker price= $31,342

-Dealer's percent of the base price: It is  91% of the base price:

$22,510*91%= $20,484

-Dealer's percent of the options price: It is  88% of the options:

$8,062*88%= $7,094

-Estimated dealer's cost= Percent of base price+percent of options price+destination charge

Estimated dealer's cost= $20,484+$7,094+$770

Estimated dealer's cost=$28,348