It took 9hrs to repair the work.
Given the information above,
$731 = $317 + $46t
We can create an equation
Let R be the repair bill
Let P be the cost of parts
Let L be the labor cost
R = P + L
R = $731
P = $317
$731 = $317 + L
Let t be the labor duration
Let r be the labor rate
L = rt
r = $46
$731 = $317 + L
$731 = $317 + 46t
46t = $731 - $317
t = 9
Therefore, It took 9hrs to repair the work.
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