Answer:
The 300 W speaker will run for, t = 26.67 h
Explanation:
Given data,
The power storage, p = 8 kWh
= 8000 Wh
The power of the speaker, P = 300 watts
It means the speaker consumes 300 watts of power in an hour.
Therefore, with 8000 Wh, the speaker will last around,
t = p / P
= 8000 / 300
= 26.67 h
Hence, the 300 W speaker will run for, t = 26.67 h
