Emily's vacuum has a power rating of 200w if the vacuum cleaner does 360000j of work how long did Emily spend vacuuming

Power = (work) / (time)

Multiply each side by (time) : (power) x (time) = (work)

Divide each side by (power) : time = (work) / (power) =

(360,000 J) / (200 W) = 1,800 sec

= 30 minutes