kim can a rent a boat from company A for $ 120 for the whole day .She can rent the same boat from company B for a fee of $ 40 plus $ 20 per hour . what is the number of hours at which the rental fees will be the same ?

120 - 40 = 80

80/20 = ?

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To determine the number of hours at which the rental fees will be the same for the two companies, Company A and Company B, we need to equate their total rental fees.

For Company A:
Rental fee = $120 (whole day)

For Company B:
Rental fee = $40 (base fee) + $20/hour (additional fee per hour)

Let's assume the number of hours rented is 'h'.

The rental fee for Company B can be expressed as:
Rental fee = $40 + $20/h * h
Rental fee = $40 + $20h

To find the number of hours when the rental fees are the same, we equate them:
$120 = $40 + $20h

Now, we can solve for 'h'.

$120 - $40 = $20h
$80 = $20h

Dividing both sides of the equation by $20, we get:
h = 4

Therefore, the rental fees will be the same after 4 hours of renting from Company B.