Answer:
7.5 seconds
Step-by-step explanation:
Required equation: Power = work done / time
Power = 400 W
Work done = 3000J
Time = ?
To find the time taken we need to rearrange the formula into:
Time = work done / power
This turns our formula into:
3000 ÷ 400 = 7.5 seconds
Meaning our answer is 7.5 seconds
Hope this helps have a lovely day :)