Answer:
3 hours
Explanation:
Step one:
given data
Dana charges
$64.95 fee, plus $45/h.
let the number of hours be x
and the total charges be y
y= 45x+64.95---------1
Tom charges
$79.95 fee, plus $40/h.
let the number of hours be x
and the total charges be y
y= 40x+79.95---------2
Step two:
Equate eqn 1 and 2 to find x
45x+64.95=40x+79.95
collect like terms
45x-40x=79.95-64.95
5x=15
divide by 15
x= 15/5
x= 3 hours