Hello!
This is simple question, because by definition power is work over time, or in another words the speed of making work. Or the quantity of work which is done during 1 second.
So `P=A/t,` where `A` is for work, `t` is for time and `P` is for power. `A` and `t` are given, so the only thing we have to do is to divide, but we have to take units of measure into account.
The unit for power is called Watt (W). It is Joule / second, not minute. To work with joules and obtain watts correctly, we have to convert the given time to seconds. It is simple, too, 40 minutes = 40*60 seconds = 2400 seconds.
Finally, `P=A/t=43750/2400=approximately 18.23 W.`
This is the answer.
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