Final answer:
The duration of a large lightning bolt can be calculated using the formula Duration = Charge / Current, where Charge is given and Current is given.
Step-by-step explanation:
A large lightning bolt had a current of 20,000 A and moved a charge of 30.0 C. The duration of the lightning bolt can be calculated using the formula:
Duration = Charge / Current
Substituting the given values, we have:
Duration = 30.0 C / 20,000 A = 0.0015 s
Therefore, the duration of the lightning bolt is 0.0015 seconds.