The number of miles in a day at which the rental costs for Company A and Company B are the same will be 40 miles.
For company A:
Fixed rent for the truck is = $ 60
Per mile rate is = $ 0.30 per mile.
The equation for the rent of a truck will be:
60 + 0.30 x
For company B:
Fixed rent for the truck is = $ 40
Per mile rate is = $ 0.80 per mile.
The equation for the rent of a truck will be:
40 + 0.80 x
Now, the number of miles in a day at which the rental costs for Company A and Company B are the same will be:
60 + 0.30 x = 40 + 0.80 x
0.80 x - 0.30 x = 60 - 40
0.50 x = 20
x = 20 ÷ 0.50
x = 40
Therefore the number of miles in a day at which the rental costs for Company A and Company B are the same will be 40 miles.
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