Answer:
t = 6 hours
Step-by-step explanation:
553 = 265 + 48 t
t = 6
Explanation:
Let R be the repair bill . Let P be the cost of parts
Let L be the labor cost
R = P +L
R
=
553
P
=
265
553
=
265
+
L
Let
t
be the labor duration
Let
r
be the labor rate
L
=
r
t
r
=
48
⇒
L
=
48
t
553
=
265
+
L
⇒
553
=
265
+
48
t
⇒
288
=
48
t
⇒
t
=
6